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Unstable 4G connection

Hello,
is anyone facing the same problem, that the 4G Signal is often very weak and unstable. For me if the signal isnt the best, it switches to edge or hsdpa+.
With my old phone i have got always 4g at the same location... Any ideas? I have already tried a factory reset and changing the sim card slots.

nexuspur said:
Hello,
is anyone facing the same problem, that the 4G Signal is often very weak and unstable. For me if the signal isnt the best, it switches to edge or hsdpa+.
With my old phone i have got always 4g at the same location... Any ideas? I have already tried a factory reset and changing the sim card slots.
Click to expand...
Click to collapse
I don't have that issue but I would say that's usual. All phones have different signal strength. It could be that your previous phone had better than op7. And its hardware related. Sometimes you can Improve it a lil bit with another firmware. But in most case there is nothing you can do.

I'm not getting good LTE reception either. I'm in Canada on Bell Mobility. I have the Chinese GM1900 model OP7 running the latest OxygenOS.
I keep switching between the OP7 and Pixel 2XL and I notice that even though the GM1900 supports all my carriers bands, the OP7 tends to choose different LTE bands than my Pixel 2XL does. Also, I noticed that the LTE Discovery app shows a weaker signal on the OP7.
I'm not sure what the issue is, and I am thinking a refund/exchange will be a hassle but I might give it a shot if I have to. I have only had the device since last Saturday so I am still hoping that there is a tweak or even another ROM I can choose to help this.

Kollachi said:
I don't have that issue but I would say that's usual. All phones have different signal strength. It could be that your previous phone had better than op7. And its hardware related. Sometimes you can Improve it a lil bit with another firmware. But in most case there is nothing you can do.
Click to expand...
Click to collapse
Than all phones have got better signal strength than OnePlus :laugh:

nexuspur said:
Than all phones have got better signal strength than OnePlus :laugh:
Click to expand...
Click to collapse
Nah. Coming from Mi9 I would say its the same compared to op7.
Edit: you could try to change your network type. Maybe there is something wrong selected.

Kollachi said:
Nah. Coming from Mi9 I would say its the same compared to op7.
Edit: you could try to change your network type. Maybe there is something wrong selected.
Click to expand...
Click to collapse
Already tried to change the network type. No change.
Also it should work out of the box. Maybe the next system updates will fix this.

I have the same issue and I've replaced the phone already and it hasn't made a difference.
My partner's on the exact same network and gets 4g where I get H+?! In the exact same place on an iPhone 6s. Go figure.
I think a firmware update/fix is needed.
Anyone submitted it as a bug?
Sent from my GM1903 using Tapatalk

Finally someone with the same problem. This is exactly my problem. H+ where others get a stable good 4g connection at the same place. Where can we submit this bug?
Edit: I have opened a thread at OnePlus. Maybe all with the same problem can comment this so OnePlus actually cares about it?
https://forums.oneplus.com/threads/unstable-4g-connection.1069237/

The Op7 has not been released for my market, is it still ok to submit a bug report there?

Anyone with the same problem?

Can confirm this has been an issue on my 3rd 7 pro, haven't tried on the first 2 before RMA'ing them unfortunately. I want the 7 because I couldn't stand the curves and the weight of the pro in the end so i'm gonna return the one I got now as well....but if this is a widespread hardware issue with both it kinda sucks for me, on most days I use 4g for at least 2 hours.

I think everyone needs to include their views on the issue posted at OnePlus so that they can see how widespread this issue really is.
Sent from my GM1903 using Tapatalk

I'm also gonna return the phone and buy another one if this won't be fixed. It really sucks because with my old(er) Phone(s) I have got better signal strength than with the new op7. This is a nogo for me...

MarylandCookie said:
I think everyone needs to include their views on the issue posted at OnePlus so that they can see how widespread this issue really is.
Sent from my GM1903 using Tapatalk
Click to expand...
Click to collapse
I created a feedback using the Community app, and I also created a log file while having the issue and sent it in with that report.

EDIT: Purchased a Redmi Note 7(the OPO7 costs 3 times more) and i have got stable LTE signal where the OPO7 only gets HSPA+. Gonna sell the OPO7. This is really a nogo for me.
Anyone else with the same problem(s)?

nexuspur said:
EDIT: Purchased a Redmi Note 7(the OPO7 costs 3 times more) and i have got stable LTE signal where the OPO7 only gets HSPA+. Gonna sell the OPO7. This is really a nogo for me.
Anyone else with the same problem(s)?
Click to expand...
Click to collapse
hey, It seems to me you have a problem with the 4g band itself did you try to change it to Europe or Us from hidden settings,
If you haven't tried that may I suggest to do so by searching on google play for an app called android hidden settings, by 0alex..
https://play.google.com/store/apps/details?id=com.kasitskyi.hiddensettings&hl=en_US
and change the band between europe and us and toggle as well between 4g and other modes just to make sure it was changed.
I hope that helps,

Note 10+ - Horrible signal strength

I received the Blue Note10+ from the Samsung preorder. (SM-N975U1). I'm using it on T-Mobile.
I'm having serious signal strength issues. My Note 8 is at 3 bars while the Note10+ has 0 or 1 bar while indoors. I usually have full 4 bars with the Note8 when I walk outside, but I rarely hit 3 bars with the Note 10+ wherever I'm at. I've never hit the full 4 bars yet with the Note 10+.
Is anyone having this issue? Any suggestions for a solution?

Bars alone don't tell the whole picture as each phone is calibrated differently. The only way to know for sure is running speed tests and comparing actual signal strength numbers in the settings.

bawobogo said:
I received the Blue Note10+ from the Samsung preorder. (SM-N975U1). I'm using it on T-Mobile.
I'm having serious signal strength issues. My Note 8 is at 3 bars while the Note10+ has 0 or 1 bar while indoors. I usually have full 4 bars with the Note8 when I walk outside, but I rarely hit 3 bars with the Note 10+ wherever I'm at. I've never hit the full 4 bars yet with the Note 10+.
Is anyone having this issue? Any suggestions for a solution?
Click to expand...
Click to collapse
Get the actual signal strength on each phone to compare...I have a TMO version of the S10+ and unlocked versions of the Note, the 10+ and a 9... the db strength measures the same on all phones, yet the TMO version shows additional bars... for example, at 99db to 104db, the tmo shows 3-4 bars, the unlocked 2...
Go to About phone, Status, sim card status to get the actual signal strength...

Same. Pixel 3 works, Note 10 has zero bars and doesn't work. I assume it's not connecting to TMobile bands

I'm on Sprint, got the Note 10+ around 9:30 yesterday. No issues whatsoever.

Can you tell us the dbm compared to the pixel? I'm really curious if I should just flash the tmo firmware before I even bother to load it.

kolyan said:
Same. Pixel 3 works, Note 10 has zero bars and doesn't work. I assume it's not connecting to TMobile bands
Click to expand...
Click to collapse
You might need to update the PRL? Assuming it's a new phone. Have you contacted TMO?
EDIT: Seems like TMO is having issues.

jackdforme said:
Can you tell us the dbm compared to the pixel? I'm really curious if I should just flash the tmo firmware before I even bother to load it.
Click to expand...
Click to collapse
I am home now. Dbm here is the same and everything works. I was in the area that had signal problems and Pixel was probably using band 12 whereas Note just lost signal for good
---------- Post added at 01:42 AM ---------- Previous post was at 01:39 AM ----------
zedwards said:
You might need to update the PRL? Assuming it's a new phone. Have you contacted TMO?
Click to expand...
Click to collapse
I am on Google Fi

Flash the T-Mobile frimware on it

bawobogo said:
I received the Blue Note10+ from the Samsung preorder. (SM-N975U1). I'm using it on T-Mobile.
I'm having serious signal strength issues. My Note 8 is at 3 bars while the Note10+ has 0 or 1 bar while indoors. I usually have full 4 bars with the Note8 when I walk outside, but I rarely hit 3 bars with the Note 10+ wherever I'm at. I've never hit the full 4 bars yet with the Note 10+.
Is anyone having this issue? Any suggestions for a solution?
Click to expand...
Click to collapse
Did you check for software update when you got your phone? When I received my unlocked Note 10 on the 21st, there was a new software update. Although the update didn't call out signal strength specifically, but you never know... After playing around with the device, I flashed it with T-Mobile firmware. I didn't have enough time to test cell signal, but haven't seen issues yesterday and today. The signal strength is on par with my Pixel 2 and S10e

I've run speed test at the same exact spot with my Note 8, OnePlus 6T and Note 10+ and they're all just about the same, between 85-90Mbps DL.

I have one less bar at home but still managed to get 120mb download speed. Havent looked at the dbm readings. Elsewhere its been just as good as my s8+.
Unlocked N10+.

Charkatak said:
Did you check for software update when you got your phone? When I received my unlocked Note 10 on the 21st, there was a new software update. Although the update didn't call out signal strength specifically, but you never know... After playing around with the device, I flashed it with T-Mobile firmware. I didn't have enough time to test cell signal, but haven't seen issues yesterday and today. The signal strength is on par with my Pixel 2 and S10e
Click to expand...
Click to collapse
I am on Tmobile and also bought the unlocked (note+) version and ran the update. If you could be so kind, what does flashing the Tmo firmware do (and how do I do it)? Would this give me everything Tmobile puts on their phones? Is there a benefit to doing that? I am curious if that would help with the signal strength.

rosedog said:
I am on Tmobile and also bought the unlocked (note+) version and ran the update. If you could be so kind, what does flashing the Tmo firmware do (and how do I do it)? Would this give me everything Tmobile puts on their phones? Is there a benefit to doing that? I am curious if that would help with the signal strength.
Click to expand...
Click to collapse
You just use Odin to flash TMobile firmware for note 10, you will have all TMobile bloatwares and features that built-in T-Mobile firmware. I believe you gain more signal bars. I also think you will be able to do video calling on your U1. I don't have note 10, still hang on with my note 9, N960U1.

rosedog said:
I am on Tmobile and also bought the unlocked (note+) version and ran the update. If you could be so kind, what does flashing the Tmo firmware do (and how do I do it)? Would this give me everything Tmobile puts on their phones? Is there a benefit to doing that? I am curious if that would help with the signal strength.
Click to expand...
Click to collapse
So if you flash T-Mobile firmware on your Note 10, you will gain few features:
1) Advanced Messaging - be able to see when person read your sms, when it was delivered or when person is typing a message. You can also send images/videos of a larger sizes about ~10MB. This will only work when you text people that have similar software or that use T-Mobile
2) Video calling will be built in to the phone dialer app - works with phones from T-Mobile that use similar software(LG, Samsung, Moto)
3) Will have 4G LTE wording in the status bar instead of just LTE or LTE+
4) T-Mobile logo on boot and sounds
5) Practically no bloatware - after flashing, during phone setup, you will be asked if you want to install 3 T-Mobile apps: Visual Voice mail, T-Mobile account app and Macfee antivirus - just don't check boxes if you don't need them.
The reason I flash my phones with T-Mobile firmware is that, before releasing they test the update so it would work better on their network and that I have T-Mobile

Charkatak said:
So if you flash T-Mobile firmware on your Note 10, you will gain few features:
1) Advanced Messaging - be able to see when person read your sms, when it was delivered or when person is typing a message. You can also send images/videos of a larger sizes about ~10MB. This will only work when you text people that have similar software or that use T-Mobile
2) Video calling will be built in to the phone dialer app - works with phones from T-Mobile that use similar software(LG, Samsung, Moto)
3) Will have 4G LTE wording in the status bar instead of just LTE or LTE+
4) T-Mobile logo on boot and sounds
5) Practically no bloatware - after flashing, during phone setup, you will be asked if you want to install 3 T-Mobile apps: Visual Voice mail, T-Mobile account app and Macfee antivirus - just don't check boxes if you don't need them.
The reason I flash my phones with T-Mobile firmware is that, before releasing they test the update so it would work better on their network and that I have T-Mobile
Click to expand...
Click to collapse
AWESOME! Thanks for the reply.
I have noticed something about my signal. It may show one bar but compared to my Note 9, so far, it is blowing it out of the water with internet access. The building I work in has a metal roof and typically that spells trouble for fast browsing. The 10+ seems to be accessing sites faster. However using the GPS this morning I could have sworn it told me it lost signal.
*edit*
Forgot to ask...when flashing the T-Mobile firmware does that trip Knox? Is that still a thing worth worrying about?

I haave two conflicting opinions on flashing tmo firmware.
Thing One.
The carriers lie to us. That's why the tmo signal is better. Not because it's better, it's probably a marketing directive. Resetting the Calc of bars shown to dbm is not optimizing anything. It's making its customers not see dead zones and drop outs. Even though you still have no access on the device.
Thing Two.
But what if I'm wrong. Is it impacting my battery life having computationally lower bars?
Oh the madness.
Sent from my SM-N975U1 using Tapatalk

I have zero bars now on N10 with T-Mobile band 66. Unfortunately I have no clue how to check bands on Pixel 3 phone, it gives be 4 bars of LTE

I have the same crap signal strength. My note 4 and 9 no probs. Changed sim card. Changed carrier, took phone To an authorized Samsung service center same problem. I find on Google that and saw how many others are having the exact same problem. The Samsung service center said they've been getting more and more calls on this problem and it's not a software issue it's a hardware issue. They told me there's not a hardware update, meaning there is not an antenna that can be replaced it's Built-in to the phone to where they couldn' change it out

flashprash65 : So are you telling us that we will never have a better signal than we currently have?
That we spent $ 1200 for a product that will never work properly?

Install T-Mobile software instead of international

Hi everyone. I purchased a OnePlus 8 5G directly from OnePlus, running on the T-Mobile network. After trying to figure out why I didn't receive the T-Mobile 5G SA update (10.5.17.IN55CB), I realized my phone is running the international version of the software. I guess this is because it's factory unlocked but I didn't realize this would limit my access to T-Mobile 5G updates! I never travel internationally and don't really care about an unlocked bootloader, etc. as long as the SIM is unlocked.
Can I manually download and install the T-Mobile software so I will get the 5G SA update (and future T-Mobile OTA updates)?

i was also wondering if that would make a difference. maybe someone could provide the modem.img from that update, if it changed. flashing the euro modem on the international rom definitely made a difference for me. not really with speed but overall coverage and stability.

nickdearing88 said:
Hi everyone. I purchased a OnePlus 8 5G directly from OnePlus, running on the T-Mobile network. After trying to figure out why I didn't receive the T-Mobile 5G SA update (10.5.17.IN55CB), I realized my phone is running the international version of the software. I guess this is because it's factory unlocked but I didn't realize this would limit my access to T-Mobile 5G updates! I never travel internationally and don't really care about an unlocked bootloader, etc. as long as the SIM is unlocked.
Can I manually download and install the T-Mobile software so I will get the 5G SA update (and future T-Mobile OTA updates)?
Click to expand...
Click to collapse
Right now you dont want it. It breaks incoming and outgoing phone calls.

Seems they pulled the update as well

Guys I'm on TMO but switched over to global voluntarily. Honestly check out TMO 5G info and you'll find it's not as great as you think. It's the beginning of a software change. Veteran modders know the beginning of updates have a lot of bugs.
If you really want it then get the MSM Tool, downgrade to 10.5.7 and let it upgrade you manually to 10.5.17. then you can get back to global if you'd like with the modem. Happy modding!

Thanks, it sounds like it was premature. I live in a rural area and my main concerns are 1) better (not reliant on LTE) 600Mhz coverage and 2) lower latency.
Do you think the global software line will get an SA update down the road? Are there any other difference between the global and T-Mobile line of software that would affect my coverage performance with LTE or 5G?

nickdearing88 said:
Thanks, it sounds like it was premature. I live in a rural area and my main concerns are 1) better (not reliant on LTE) 600Mhz coverage and 2) lower latency.
Do you think the global software line will get an SA update down the road? Are there any other difference between the global and T-Mobile line of software that would affect my coverage performance with LTE or 5G?
Click to expand...
Click to collapse
Great question, This is my first OnePlus phone so I can't tell you if and when gonna will get the update. What I have heard of that TMO is rolling out 5G in several layers. This first one is pretty low key but it had some books already. Second and third would be better. I guess check around here to see more about it. If you are absolutely sure you want this update then you can use MSM took to downgrade then just let the TMO servers do the work for you. Happy modding!

nickdearing88 said:
Thanks, it sounds like it was premature. I live in a rural area and my main concerns are 1) better (not reliant on LTE) 600Mhz coverage and 2) lower latency.
Do you think the global software line will get an SA update down the road? Are there any other difference between the global and T-Mobile line of software that would affect my coverage performance with LTE or 5G?
Click to expand...
Click to collapse
I would be surprised if the global version got an update for SA 5g. That's TMO specific and OnePlus would have zero care about a specific carrier of all the world's carriers .
There are differences in modems according to TMobile. I can't remember specifics but I think it was carrier aggregation on band 66 ( I don't remember much so I may be way off)

Josh McGrath said:
I would be surprised if the global version got an update for SA 5g. That's TMO specific and OnePlus would have zero care about a specific carrier of all the world's carriers .
There are differences in modems according to TMobile. I can't remember specifics but I think it was carrier aggregation on band 66 ( I don't remember much so I may be way off)
Click to expand...
Click to collapse
Yeah, I figured that was unlikely with the global version, although I'm sure carriers across the world will begin deploying SA 5G at some point.
I was going to start a new thread but after you notes about the modem differences, this might relate to another issue I've noticed: When connected to Band 2 (1900 Mhz) with LTE or 5G, I was getting really good speeds (~30Mbps Down/5Mbps Up). Now, when I test using 5G or LTE (by turning off 5G) my speed tests are horrible: ~1Mbps Down/0.7Mbps Up. I have tested with "Smart 5G" on and off, and also removed and reinstalled the SIM card. If I pop the SIM card out and put it back into my Pixel 2, I get 30Mpbs Down/5Mpbs Up with LTE on Band 2. My Pixel 2 was purchased directly from Google and is factory unlocked/direct Google updates.
Do you think this is because of the carrier agg issue you mentioned? In my area Band 4/Band 66 is only used for T-Mobile 2G/3G, to my knowledge. LTE is offered on Bands 2, 12, and 71. 5G NR seems to only be on Band 71 here at present.

Josh McGrath said:
I would be surprised if the global version got an update for SA 5g. That's TMO specific and OnePlus would have zero care about a specific carrier of all the world's carriers .
There are differences in modems according to TMobile. I can't remember specifics but I think it was carrier aggregation on band 66 ( I don't remember much so I may be way off)
Click to expand...
Click to collapse
Josh, not often this happens, but I disagree with what you say here. Normally I agree with everything you post. However, this time I have to disagree.
5G SA is not at all T-Mo specific and is a standardized implementation for carriers should they choose to go that route.
However, OnePlus caring about it is up in the air, lulz!
See here: https://ibasis.com/what-is-5g-sa-nsa/
5G SA means stand alone. This means that the device will only ride on 5G and not aggregate with 4G.
If I am wrong please correct me. Thanks!
Nathan.7118391 said:
If you are absolutely sure you want this update then you can use MSM took to downgrade then just let the TMO servers do the work for you.
Click to expand...
Click to collapse
I and many others posted that they cannot get the update. Those that did said they had connectivity issues. I suspect that T-Mo pulled the update. I don't know this for fact, however I cannot get the update. T-Mo site says check back after 8/31. That's crazy weird. Others also complain. I think the update is borked hence the lack of wide roll out. . Again, dont know this for fact but just speculating...

Scott said:
Josh, not often this happens, but I disagree with what you say here. Normally I agree with everything you post. However, this time I have to disagree.
5G SA is not at all T-Mo specific and is a standardized implementation for carriers should they choose to go that route.
However, OnePlus caring about it is up in the air, lulz!
See here: https://ibasis.com/what-is-5g-sa-nsa/
5G SA means stand alone. This means that the device will only ride on 5G and not aggregate with 4G.
If I am wrong please correct me. Thanks!
...
Click to expand...
Click to collapse
For sure. I do stand corrected here on SA. I was referring to the specific bands that TMobile uses for SA 5g vs world bands SA 5g but who knows if that's impossible but I, like you, think that OP will not care about it or would screw it up.
As for the modem differences, I was referring to an older post from TMobile on their forums during the 6t launch days so I can't really remember exactly what it was. I think if you searched my posts from way you could find it
Speaking of, I am incredibly disappointed in tmos 5g. I'm lucky to get 20 dl. Are you having any better luck

Scott said:
Josh, not often this happens, but I disagree with what you say here. Normally I agree with everything you post. However, this time I have to disagree.
5G SA is not at all T-Mo specific and is a standardized implementation for carriers should they choose to go that route.
However, OnePlus caring about it is up in the air, lulz!
See here: https://ibasis.com/what-is-5g-sa-nsa/
5G SA means stand alone. This means that the device will only ride on 5G and not aggregate with 4G.
If I am wrong please correct me. Thanks!
I and many others posted that they cannot get the update. Those that did said they had connectivity issues. I suspect that T-Mo pulled the update. I don't know this for fact, however I cannot get the update. T-Mo site says check back after 8/31. That's crazy weird. Others also complain. I think the update is borked hence the lack of wide roll out. . Again, dont know this for fact but just speculating...
Click to expand...
Click to collapse
Yeah I think you are right. As soon as it was available it became unavailable. They will roll it out when those bugs are fixed. This is one of the reasons I don't like TMO stock. They are buggy and slow to update. Not to mention all the bloatware.

Josh McGrath said:
Speaking of, I am incredibly disappointed in tmos 5g. I'm lucky to get 20 dl. Are you having any better luck
Click to expand...
Click to collapse
I am EXTREMLEY disappointed
History of my observations...
When I first switched to T-Mobile with the 6T the speeds were great. Well, decent. But around the time the S20 series came out I noticed extreme sluggishness with the 6T. Compared it to the people in the store and there's wer the same. A massive down turn in speed. I suspect it had something to do with the implementation of 5G in the area. It was my guess... Anways, moved back to T-Mobile two months ago and got this phone. The speeds are even worse. So this phone on 5G is just as bad as LTE. I disabled 5G and tested. Same results.
Long story short, T-mobile did something and slowed my connection down.
Your lucky. Very luck. I routinely get 2 to 5 mbs when I am home. In town I dont think I got over 25Mbs. AT&T has the best network in Fargo. 200MBS down on S20U all day!

Terrible data speeds.

Just got the OnePlus 8 5G for "Sprint".
I took the June security patch update and my cellular data has been garbage. See attached photos.
I can't be the only one experiencing this, right?
I've contacted Sprint and Tmo.
They had me reset all my connections (wifi, bluetooth, cellular) and they refreshed their end.
Still crap.
Any ideas?

Welcome to 5g with TMO. Also the new modem is garbage too to begin with. You could always flash the previous version modem or turn off 5g altogether.

So I'm trying to reply on the Gcam thread for OnePlus 8 and it keeps telling me "Post creation failed"
Why?

crazynapkinman said:
So I'm trying to reply on the Gcam thread for OnePlus 8 and it keeps telling me "Post creation failed"
Why?
Click to expand...
Click to collapse
If you're using the app, it's cause the app really really sucks

Josh McGrath said:
Welcome to 5g with TMO. Also the new modem is garbage too to begin with. You could always flash the previous version modem or turn off 5g altogether.
Click to expand...
Click to collapse
I was sort of thinking the same thing.

Scott said:
I was sort of thinking the same thing.
Click to expand...
Click to collapse
I actually got 120 something down peak and avg of 60 after the update. But, still, I was consistently getting 120+ on lte on my 7t. It's like when tmo sees a 5g phone on their network, they reduce lte speeds. But the new software is a definite improvement unless it's related to the additional 2.5 ghz 5g band
edit: The latency and ping is still terrible though . I should have just kept my 7t

Question TMobile (USA) network speed

I don't see 5G icon. But we got LTE+ on TMobile (usa) (VoLTE pre activated)
Download speed is fantastic. Upload is not

avetny said:
I don't see 5G icon. But we got LTE+ on TMobile (usa) (VoLTE pre activated)
Download speed is fantastic. Upload is not
Click to expand...
Click to collapse

has anyone tried to unlock more bands?
following something like https://forum.xda-developers.com/t/...device-use-your-phone-globally-no-bs.2871269/

Washo4evr said:
has anyone tried to unlock more bands?
following something like https://forum.xda-developers.com/t/...device-use-your-phone-globally-no-bs.2871269/
Click to expand...
Click to collapse

It is at the standard of the H.W not the S.W.

The same questions were asked of the 10 ultra. Some said hard, some software but no one posted any success in opening more bands.

Washo4evr said:
has anyone tried to unlock more bands?
following something like https://forum.xda-developers.com/t/...device-use-your-phone-globally-no-bs.2871269/
Click to expand...
Click to collapse
Reasonable question man, those replies suck. It has the same modem as the iPhone 13, it's a Snapdragon X65 5G so technically you should be able to. If not in NV, you could in software programming tool of Qualcomm, might have to be the newest software though. If you could identify the modem chip number in a teardown video possibly we could find the product model number and see if it's a hardware limited or base chip limited by firmware.

That makes sense. Back in the day, I had a Zuk Z2 Pro and it worked but haven't had a phone with a snapdragon since.
Thanks Jdorman12 for replying with actual words, not a single emoji
If I end up getting a 12S, I will give it a try