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[Q] [SOLVED] Signal issues and no LTE

[SOLVED!!!] flashed factory images from google (this on it's own didn't seem to fix it.), and updated to 4.4.2 via OTA. suddenly works it again. not sure exactly why this worked when other similar things should have accomplished the same thing, must have been something wrong in the 4.4.1 build.
the issue:
my nexus 5 no longer connects to LTE ever, even though it used to get it almost everywhere.
the radio frequently disconnects. it sometimes isn't working despite showing 3-4 bars of HSPA.
the timeline:
12/03 got my nexus 5 and immediately rooted with CF-auto-root.
12/06 flashed bigxie's stock 4.4.1 rom and radio
12/08 issue started
12/09 flashed older radios, updated to 4.4.2, restored backup to pure stock 4.4, etc. etc.
12/10 issue persists, currently on stock 4.4.2 with newest radio **.23

Try to go back to radio modem **.17. I think the problem is in **.23 radio. For me **.23 gives low signal...
vonlupe said:
the issue:
my nexus 5 no longer connects to LTE ever, even though it used to get it almost everywhere.
the radio frequently disconnects. it sometimes isn't working despite showing 3-4 bars of HSPA.
the timeline:
12/03 got my nexus 5 and immediately rooted with CF-auto-root.
12/06 flashed bigxie's stock 4.4.1 rom and radio
12/08 issue started
12/09 flashed older radios, updated to 4.4.2, restored backup to pure stock 4.4, etc. etc.
12/10 issue persists, currently on stock 4.4.2 with newest radio **.23
Click to expand...
Click to collapse

Johnny75_ said:
Try to go back to radio modem **.17. I think the problem is in **.23 radio. For me **.23 gives low signal...
Click to expand...
Click to collapse
i have already tried this, but i'll return to **.17 and leave it there for now. i've seen a lot of people complaining of low signal on the new radios, but this doesn't seem to be the entirety of the issue for me...

well, this sucks i've flashed the stock image and it still is the same.
it has to be a hardware issue right?

Google cheaped out on antenna. Better to buy a different premium device that's not $350
Sent from **Nexus 5 signal sucks**

This is related to the new radio. Go back to the *.17 radio/modem.
I had between 3 to 10 dB less on LTE with Sprint on the new radio/modem.
Sent from my Nexus 5 using xda app-developers app

Where can I see which version of the radio I am using?

go to the phones main settings, more, mobile networks, prefered network type.. is lte picked? also, you can see which radio you are using in about phone(baseband version).

Yeah its probably just radio / baseband as mentioned earlier. It's nothing to do with "cheaped out" hardware. You had signal before so likely software. Hardware is great imho. I get double the quality signal than my crappy old S3.
-----------------------
Sent via tapatalk.
I do NOT reply to support queries over PM. Please keep support queries to the Q&A section, so that others may benefit

Am having the same exact problem. Once I updated to 4.4.2 no connection at all.
I rolled back to factory image, still same issue.
---------- Post added at 06:41 PM ---------- Previous post was at 06:00 PM ----------
I think I've found the issue, I bet you my #[email protected] if you check your IMEI it would be 0.
Am trying to find out a way to get everything working again I'll report back if succeeded.

i am having issues too. (sprint). it seems the phones just aborts the network and i have to manually turn it on. i would not get a text for an hour then i turn on the airplane mode then off and i get like 10 texts all sent at the same time. should i take the phone back? im not rooted or anything yet.

kindiboy said:
Am having the same exact problem. Once I updated to 4.4.2 no connection at all.
I rolled back to factory image, still same issue.
---------- Post added at 06:41 PM ---------- Previous post was at 06:00 PM ----------
I think I've found the issue, I bet you my #[email protected] if you check your IMEI it would be 0.
Am trying to find out a way to get everything working again I'll report back if succeeded.
Click to expand...
Click to collapse
Tampering /changing your imei is illegal
Sent from my Nexus 5

dicecuber said:
Tampering /changing your imei is illegal
Sent from my Nexus 5
Click to expand...
Click to collapse
and having a 0 IMEI is?
----
on a more useful note... called Google they have no clue how to solve this issue. RMA away...
Called T-Mobile they said they think it's a SIM issue, tried another SIM same issue.

Yeah better to just keep your original imei than to change it to 0
Sent from my Nexus 5

dicecuber said:
Tampering /changing your imei is illegal
Sent from my Nexus 5
Click to expand...
Click to collapse
Fixing it is not though. That's why mobile repair shops are legally allowed to repair imei as long as you can prove it.
-----------------------
Sent via tapatalk.
I do NOT reply to support queries over PM. Please keep support queries to the Q&A section, so that others may benefit

my issue has been resolved. updated OP.

The new radio works fine for me. Never had any issues with any of the radios. Maybe it reacts differently with different carriers?
Sent from my Nexus 5 using Tapatalk

Any TRUE fix for signal drops

Ive a chinese oneplus one but no matter what i do the 3G which had ask the right frequencys constantly drops im mostly on 2G which is no good so is there a fix. Yet?

Be sure to report it here.
https://jira.cyanogenmod.org/plugins/servlet/mobile#issue/BACON-132/comment/34921
And no. Still no fix.
Going through the same issue myself except I get LTE but no 3G due to which all my calls go to voicemail
Sent from my A0001 using XDA Free mobile app

hashim71 said:
Be sure to report it here.
https://jira.cyanogenmod.org/plugins/servlet/mobile#issue/BACON-132/comment/34921
And no. Still no fix.
Going through the same issue myself except I get LTE but no 3G due to which all my calls go to voicemail
Sent from my A0001 using XDA Free mobile app
Click to expand...
Click to collapse
Is your Preferred Signal on LTE/GSM (auto)? Check *#*#4636#*#* into phone.

Doesn't matter. I've tried too. It's a little better but the problem still exists. The phone fails to drop to 2G when a call is incoming.
Sent from my A0001 using XDA Free mobile app

Hope it is solved

https://forums.oneplus.net/threads/poor-signal-strength-not-looking-good.93350/
Let's all complain at OnePlus. Something might happen. Something good too...

Any change for any of you on the new ota update

The latest color os radio has fixed the signal issue. I downloaded and installed and can confirm it fixes it. Here is the radio. Flash with fast boot
https://app.box.com/s/hl15axfutntfu3d15dve

bash_array said:
The latest color os radio has fixed the signal issue. I downloaded and installed and can confirm it fixes it. Here is the radio. Flash with fast boot
https://www.dropbox.com/s/mqa2zfs1i5p6u79/NON-HLOS.bin?dl=0
Click to expand...
Click to collapse
Thanks for sharing, but you might want to include the actual fastboot command that needs to be issued in your post too.
Transmitted via Bacon

Fastboot flash radio NON-HLOS.bin

bash_array said:
The latest color os radio has fixed the signal issue. I downloaded and installed and can confirm it fixes it. Here is the radio. Flash with fast boot
https://app.box.com/s/hl15axfutntfu3d15dve
Click to expand...
Click to collapse
Do you have a link that cites this fix? I can't seem to find it and just want to confirm.

Ok thanks ill try

bash_array said:
The latest color os radio has fixed the signal issue. I downloaded and installed and can confirm it fixes it. Here is the radio. Flash with fast boot
https://app.box.com/s/hl15axfutntfu3d15dve
Click to expand...
Click to collapse
Don't think it fixes it for me its better i didnt switch to 2g on my daily commute to work which it usually would, but it still drops but not as bad

Same here too. Less troublesome after flashing the ColorOS radio.. My Moto G is leagues ahead...

Hope it's not an hardware issue

bash_array said:
The latest color os radio has fixed the signal issue. I downloaded and installed and can confirm it fixes it. Here is the radio. Flash with fast boot
https://app.box.com/s/hl15axfutntfu3d15dve
Click to expand...
Click to collapse
got another link? it seems to be removed

WIFI Weak on LOLLIPOP

Hi
I have a very annoying issue regarding WiFi. After flashing any custom kernel (Ak, furnace...), my wifi speed turns very very slow, it drops from 40 mbs to 2 mbs.
And the only way to fix it is with this app: https://play.google.com/store/apps/details?id=com.brilliapps.wifiandmorefixer&hl=es
As i said this happens after a kernel change. I changed thing on my router, like channel, security protocols, qos but no way, it´s not a router problem.
Also i restored the phone to stock ( including a bootloader relock, etc...)
Anyone else have this issue? How can i fix it permanently?
Thank you
Update:
nonoperez said:
First of all thanks for this great rom. Since the begining of the year, with the new radio my wi-fi reception is very weak, if I'm farer than 4 o 5 metres from the router my wi-fi disconect. I've tried everything, different roms, kernels, clean installs from 44s strock without luck. It works fine with 4.4. My security protocol is WPA2-Personal.
Now I've done a clean install from stock 44s to today release following the instruction, everything is great except wi-fi.
Anyone having this issue? Thanks in advance.
Click to expand...
Click to collapse
I have the same problem as you. the only solution i found is to use 5GHz band.
On blisspop builds (cm12 based roms also) older than 01/01/2015 i was able to fix that problem by using this tool: https://play.google.com/store/apps/details?id=com.brilliapps.wifiandmorefixer&hl=es
but on the newer builds it does not work. i think it may be some firmware related thing or something cm12 changed.
I have a thread open for it here: http://forum.xda-developers.com/oneplus-one/help/wifi-extremely-slow-kernel-flash-t2978780
And please, could some experienced dev tell us whats going on?

Solved:
The issue seems to be solved for now.
What i did was resetting the phone to color OS stock Rom and then flashed back my actual lollipop ROM.
Enviado desde mi A0001 mediante Tapatalk

Thank you, this worked for me. I was only getting 1mb download speeds. Ran the app and now my one plus is getting 49mb download speeds. Now my one plus is perfect. Really really thank you.
Sent from my A0001 using XDA Free mobile app

tonybuzz32000 said:
Thank you, this worked for me. I was only getting 1mb download speeds. Ran the app and now my one plus is getting 49mb download speeds. Now my one plus is perfect. Really really thank you.
Sent from my A0001 using XDA Free mobile app
Click to expand...
Click to collapse
you are welcome..
Indeed its really strange.
Anyone knows why is this happening after every kernel change?

Update:
Originally Posted by nonoperez
First of all thanks for this great rom. Since the begining of the year, with the new radio my wi-fi reception is very weak, if I'm farer than 4 o 5 metres from the router my wi-fi disconect. I've tried everything, different roms, kernels, clean installs from 44s strock without luck. It works fine with 4.4. My security protocol is WPA2-Personal.
Now I've done a clean install from stock 44s to today release following the instruction, everything is great except wi-fi.
Anyone having this issue? Thanks in advance.
Click to expand...
Click to collapse
I have the same problem as you. the only solution i found is to use 5GHz band.
On blisspop builds (cm12 based roms also) older than 01/01/2015 i was able to fix that problem by using this tool: https://play.google.com/store/apps/d...orefixer&hl=es
but on the newer builds it does not work. i think it may be some firmware related thing or something cm12 changed.
I have a thread open for it here: http://forum.xda-developers.com/onep...flash-t2978780
And please, could some experienced dev tell us whats going on?

Same problem here but with temasek everything work fine

bihariel said:
Hi
I have a very annoying issue regarding WiFi. After flashing any custom kernel (Ak, furnace...), my wifi speed turns very very slow, it drops from 40 mbs to 2 mbs.
And the only way to fix it is with this app: https://play.google.com/store/apps/details?id=com.brilliapps.wifiandmorefixer&hl=es
As i said this happens after a kernel change. I changed thing on my router, like channel, security protocols, qos but no way, it´s not a router problem.
Also i restored the phone to stock ( including a bootloader relock, etc...)
Anyone else have this issue? How can i fix it permanently?
Thank you
Click to expand...
Click to collapse
WOW ! INCREDIBLE !! I even went through the Technical Support, they replaced my device and still had the issue. I used this application and it works !! Went from 1-2mbps speedest to my full connection : 28 MBPS ! Using CM12.0S latest official CM ROM as today

sprint s6 edge 5.1.1 stock firmware please!

ok so i updated ,via OTA ,to version 5.1.1
after this i decided to try to root it using a flashable file (odin) and now the touch screen doesnt work.
i dont know what else i could possible do, i tried factory reseting even though i knew it wouldnt work since i flashed a boot.img file
so my last guess would be to flash the stock firmware, i have the stock firmware for 5.0.2 but you cant downgrade so i really need the G925PVPU2B0F7 firmware
if anyone knows where i could get it or any other ways of fixing it please say!

z0code0z said:
ok so i updated ,via OTA ,to version 5.1.1
after this i decided to try to root it using a flashable file (odin) and now the touch screen doesnt work.
i dont know what else i could possible do, i tried factory reseting even though i knew it wouldnt work since i flashed a boot.img file
so my last guess would be to flash the stock firmware, i have the stock firmware for 5.0.2 but you cant downgrade so i really need the G925PVPU2B0F7 firmware
if anyone knows where i could get it or any other ways of fixing it please say!
Click to expand...
Click to collapse
Have you tried Smart Switch on the PC?
Sent from my SM-G925P using Tapatalk

optimummind said:
Have you tried Smart Switch on the PC?
Sent from my SM-G925P using Tapatalk
Click to expand...
Click to collapse
yeah, it recognizes my phone but i cant really do anything with it, according to smart switch, my phone is fully updated so i cant change anything and emergency recovery only works in a specific situation
the reason i needed the stock firmware for that version was because while attempting to get root i flashed (with odin) a boot.img and now the phones touch screen wont work

It took a month before the firmware was released. If you have Sprint insurance you can get a replacement for $0 dollars or $75 if you dont. You have to visit a repair store to start the paperwork. Jus claim, the phone touch screen didnt work after the update.

dhonzik said:
It took a month before the firmware was released. If you have Sprint insurance you can get a replacement for $0 dollars or $75 if you dont. You have to visit a repair store to start the paperwork. Jus claim, the phone touch screen didnt work after the update.
Click to expand...
Click to collapse
what if they check the knox counter? and if they know that i flashed several things, would they still replace it?

z0code0z said:
what if they check the knox counter? and if they know that i flashed several things, would they still replace it?
Click to expand...
Click to collapse
I've taken Samsung devices back to the carrier in the past for various reasons and they never looked. You should be fine. Samsung is the only one who really may check

Experimental - http://forum.xda-developers.com/showthread.php?t=3152529
It may or may not work...
Sent from my SM-G920P using Tapatalk

djvoleur said:
Experimental - http://forum.xda-developers.com/showthread.php?t=3152529
It may or may not work...
Sent from my SM-G920P using Tapatalk
Click to expand...
Click to collapse
Hmmmm

Soooperstar said:
Hmmmm
Click to expand...
Click to collapse
Let me no if you try that.

lusciousbeard said:
Let me no if you try that.
Click to expand...
Click to collapse
If a odin firmware was available as a backup, I'd definitely give it a try. I think it might work being US cellular but I won't be trying it without a plan B lol. I'm sure one of these eager guys will jump out there and give it a try. I'm waiting patiently.

Soooperstar said:
If a odin firmware was available as a backup, I'd definitely give it a try. I think it might work being US cellular but I won't be trying it without a plan B lol. I'm sure one of these eager guys will jump out there and give it a try. I'm waiting patiently.
Click to expand...
Click to collapse
Ha! Yeah I hear you... I might give it a try later today. I'll keep you posted

lusciousbeard said:
Ha! Yeah I hear you... I might give it a try later today. I'll keep you posted
Click to expand...
Click to collapse
Cool..... Let us know

z0code0z said:
ok so i updated ,via OTA ,to version 5.1.1
after this i decided to try to root it using a flashable file (odin) and now the touch screen doesnt work.
i dont know what else i could possible do, i tried factory reseting even though i knew it wouldnt work since i flashed a boot.img file
so my last guess would be to flash the stock firmware, i have the stock firmware for 5.0.2 but you cant downgrade so i really need the G925PVPU2B0F7 firmware
if anyone knows where i could get it or any other ways of fixing it please say!
Click to expand...
Click to collapse
Hey, I did the same thing you did and someone had told me about this..... http://forum.xda-developers.com/spr...t/5-1-1-stock-of7-kernel-root-7-4-15-t3150350
Download the stock kernel from this forum above.
I flashed it via Odin and now have my touchscreen back. Now it's not a total fix but I'm now writing you this on my edge with the touchscreen working. It's the only thing available right now for us. Two things that don't work are the back and recent apps buttons and when you lock your phone the screen won't come back on without restarting into download mode then hitting restart phone from there. So I've just been keeping phone plugged in for the most part because of this so screen won't go off.

well one of you should try the guys recovery/root from u.s. cellular..lolol

DruoGaby said:
well one of you should try the guys recovery/root from u.s. cellular..lolol
Click to expand...
Click to collapse
Just tried that recovery/root. Every thing seemed to work great until I noticed I had no data so I'm going to stick with the one I was using for now. If someone could combine the two somehow we would be in great shape

S6EdgE2 said:
Just tried that recovery/root. Every thing seemed to work great until I noticed I had no data so I'm going to stick with the one I was using for now. If someone could combine the two somehow we would be in great shape
Click to expand...
Click to collapse
lol awesome!!!..the dev should know that..maybe i can ask somebody for help..i know some folks..so your on 5.1.1 rooted just no data... or other things as well

DruoGaby said:
lol awesome!!!..the dev should know that..maybe i can ask somebody for help..i know some folks..so your on 5.1.1 rooted just no data... or other things as well
Click to expand...
Click to collapse
Yup 5.1.1 rooted. Both work just each one has its problems. I'd rather have working data using the stock of7 kernel tho. The us cellular kernel has working buttons and screen comes back on after it goes off but no data so if you could talk to some people about this maybe we could get a working kernel with root where everything works, which would be awesome.
---------- Post added at 06:47 PM ---------- Previous post was at 06:38 PM ----------
S6EdgE2 said:
Yup 5.1.1 rooted. Both work just each one has its problems. I'd rather have working data using the stock of7 kernel tho. The us cellular kernel has working buttons and screen comes back on after it goes off but no data so if you could talk to some people about this maybe we could get a working kernel with root where everything works, which would be awesome.
Click to expand...
Click to collapse
I tried posting a comment in the us cellular forum about the sprint edge having no data using that kernel but I have under 10 posts so it won't allow me to I guess...

can u point me a link to the one that has data?...i dont know which is it...thanks..maybe i can get them to check both and see the changes..commit them to the u.s. celler one...that'll be tight..ill keep an eye for when u post it
---------- Post added at 02:56 PM ---------- Previous post was at 02:52 PM ----------
S6EdgE2 said:
Yup 5.1.1 rooted. Both work just each one has its problems. I'd rather have working data using the stock of7 kernel tho. The us cellular kernel has working buttons and screen comes back on after it goes off but no data so if you could talk to some people about this maybe we could get a working kernel with root where everything works, which would be awesome.
---------- Post added at 06:47 PM ---------- Previous post was at 06:38 PM ----------
I tried posting a comment in the us cellular forum about the sprint edge having no data using that kernel but I have under 10 posts so it won't allow me to I guess...
Click to expand...
Click to collapse
ill post for you

DruoGaby said:
can u point me a link to the one that has data?...i dont know which is it...thanks..maybe i can get them to check both and see the changes..commit them to the u.s. celler one...that'll be tight..ill keep an eye for when u post it
Click to expand...
Click to collapse
Yup. Here it is.
http://forum.xda-developers.com/spr...t/5-1-1-stock-of7-kernel-root-7-4-15-t3150350

S6EdgE2 said:
Yup. Here it is.
http://forum.xda-developers.com/spr...t/5-1-1-stock-of7-kernel-root-7-4-15-t3150350
Click to expand...
Click to collapse
this is th one with the working data?..i dont wanna mix them up..lol

Verizon LG-V20 (VS995) Poor network on T-Mobile = Verizon firmware restrictions?

Hi everyone,
I just switched over to T-Mobile and the first thing I noticed is that my LGV20(VS995) was not properly connecting to the T-Mobile network, I tried every possible APN setting and the connection was always unstable. Sometimes I briefly got an 4G LTE signal but when I ran countless tests and the connection speeds were always below 10mbps.
I recently flashed the Lineage OS on my phone to check if it was possibly a Verizon firmware restriction and I found that as soon as the phone booted with the Lineage OS, the phone recognized the sim card as T-Mobile, and right off the bat, the phone connected to LG LTE. I ran network tests using Ookla's Speed Test apk, and now I get consistent speeds over 30mbps, highest being nearly 90mbps. (tests were done using same server and in the same area)
My question is,
is there some sort of network band restriction embedded in the Verizon firmware? and is there a workaround for this on stock Verizon firmware?

I was havong this problem with my ls997 can this lineage OS work on my ls997?
Sent from my LG-LS997 using Tapatalk
---------- Post added at 03:27 AM ---------- Previous post was at 03:18 AM ----------
Do u have a link to the os ??
Sent from my LG-LS997 using Tapatalk

bikermites said:
I was havong this problem with my ls997 can this lineage OS work on my ls997?
Sent from my LG-LS997 using Tapatalk
---------- Post added at 03:27 AM ---------- Previous post was at 03:18 AM ----------
Do u have a link to the os ??
Click to expand...
Click to collapse
The LS997 is currently supported, however, this ROM is currently in its alpha stages. I've been using it daily and thus far it's stable.
Here's the link, assuming you have already unlocked the bootloader and rooted your phone:
https://forum.xda-developers.com/v20/development/dev-cm14-t3509953

I had a similar situation with AT&T sim card in the vs995. I would get temporary lte connection then back to H. I assumed I had a weak band 4 connection but maybe I'll try that rom & see if it helps.

ajent said:
I had a similar situation with AT&T sim card in the vs995. I would get temporary lte connection then back to H. I assumed I had a weak band 4 connection but maybe I'll try that rom & see if it helps.
Click to expand...
Click to collapse
If u get through please let me know
Sent from my LG-LS997 using Tapatalk

I'm about to try in a bit too.Finally got abd figured out .I will let you know..I have vzw v20 and wanting it on tmo
Sent from my Nexus 6P using Tapatalk

Ok
Sent from my LG-LS997 using Tapatalk

After installing the rom, it gave me the sim card not found error, flashed gapps and lte internet worked, but couldn't text or call. Tried to restore my backup, but it wouldnt let me log into phone with fingerprint, and told me my pin was wrong. Installing not so stock rom now.

Ok
Sent from my LG-LS997 using Tapatalk

ajent said:
After installing the rom, it gave me the sim card not found error, flashed gapps and lte internet worked, but couldn't text or call. Tried to restore my backup, but it wouldnt let me log into phone with fingerprint, and told me my pin was wrong. Installing not so stock rom now.
Click to expand...
Click to collapse
@ajent
Did you install the latest 7.1 gaps, ARM64bit?
When you go to the site select 7.1 gaps, ARM64bit (LGV20 runs on ARM64bit) & and stock. You have to install both back to back before booting up.
Do not wipe system prior to installation as lineage OS patches the system. only wipe data, cache, and dalvik.
Also in settings go to APN and check if what APN preset you have selected, the ROM comes with presets for all carriers.
Those are the 3 things that I can think of that would cause those issues.
Everything works fine for me besides the second screen at the top and Bluetooth. I haven't noticed anything else so far, I've had Lineage OS installed since 01/13.

Gapps selection for LGV20

Did you flash the Verizon version,or T-Mobile verson
Sent from my VS995 using Tapatalk

kenbrownstone said:
Did you flash the Verizon version,or T-Mobile verson
Click to expand...
Click to collapse
I flashed the one for Verizon (vs995)

lightX87 said:
I flashed the one for Verizon (vs995)
Click to expand...
Click to collapse
You on t mobile?
Sent from my VS995 using Tapatalk
---------- Post added at 01:03 AM ---------- Previous post was at 01:00 AM ----------
lightX87 said:
I flashed the one for Verizon (vs995)
Click to expand...
Click to collapse
Sorry forgot you were the o.o..thanks for thread
kenbrownstone said:
You on t mobile?
Sent from my VS995 using Tapatalk
Click to expand...
Click to collapse
Sent from my VS995 using Tapatalk

kenbrownstone said:
You on t mobile?
Sent from my VS995 using Tapatalk
---------- Post added at 01:03 AM ---------- Previous post was at 01:00 AM ----------
Sorry forgot you were the o.o..thanks for thread
Click to expand...
Click to collapse
No prob , anytime!
And yes, just switched to Tmobile since Verizon took away my unlimited data and I wasn't even near the 200 gigs..

Did u try to register the device on the tmobile network on the stock firmware via network settings?

Mikekelso421 said:
Did u try to register the device on the tmobile network on the stock firmware via network settings?
Click to expand...
Click to collapse
As mentioned in OP, I tried a combination of APN settings, and yes, I tried to register the phone manually and auto.
When I registered the phone to T-Mobile LTE and the phone connects to LTE for a brief moment and goes back to switching from 3G and H+. And even when it's on "4G" the network speeds are unstable.
I noticed I wasn't the only one having this issue when switching networks from Verizon to Tmobile so I rooted the phone and installed the Not so Stock ROM and still had the same results, then I searched for a custom ROM and found Lineage OS (thank God) I installed it and right away after booting, the phone recognized the T-Mobile simcard; as apposed to stock, where it kept giving me a notification saying Verizon simcard not found even when registered to T-Mobile

if you install the US996 Rom its pretty much stock rom with LTE working. I would recommend it with the konvergence kernel because well thats really the only one I think that makes our phone boot with that rom.

When you buy a carrier branded phone it comes with certain bands activated for that network with the others disabled. While this is done at a software level, it is done on a partition and files not even remotely controlled by the ROM. Likely your bands are locked behind some level of encryption that you would need special software to unlock. IF it isn't hardware locked (which is highly unlikely since this is a global phone).
tl;dr If you want to use non-common LTE bands (2,4,etc) for other carriers you need that carrier's device or an actual unlocked device.

Actually this has been solved by installing ported firmware based on the international version of LGV20 or lineage OS. I have a constant 4G connection with MMS and calls properly functioning. Even though the verizon phones are global, at software level, certain bands/network settings are indeed restricted.