Related
Just wanted to start up the discussion thread for the Cricket Galaxy S3 model SCH-R530C. We share models with the USCC version, but the data doesnt work correctly when a USCC build is flashed.
Heres a write-up on how to root the Cricket GS3:
http://www.cricketusers.com/cricket...laxy-s3-root-recovery-tutorial-cwm-video.html
LET THE BUILDS BEGIN...please.
This goes in "android development" not a verizon Galaxy S3 side of a forum
Sent from my SCH-I535 using Tapatalk 2
Actually. The cricket GS3 is basically the USCC GS3 with a different modem. So, they're very similar. Exactly why its in this forum.
http://www.cricketusers.com/cricket...ricket-wireless-samsung-galaxy-s3-thread.html
Have everything working but the camera and MMS it looks like. I'm not a dev by far so someone who knows what they're doing can do this right I'm sure.
NANDROID BACKUP!
My cousin got the cricket s3, ive been helping him out, getting rooted and cwm, now just need a real ROM. I cant seem to find any dedicated places for this phone specifically, there doesnt seem to be much dev work on it either, or am i wrong?
Mystikalrush said:
My cousin got the cricket s3, ive been helping him out, getting rooted and cwm, now just need a real ROM. I cant seem to find any dedicated places for this phone specifically, there doesnt seem to be much dev work on it either, or am i wrong?
Click to expand...
Click to collapse
There isn't much work on US Cellular and MetroPCS so you can expect the same for Cricket. ShabbyPenguin is being a gentleman and devoting some time. He's already started to post on CricketUsers.
I got everything working minus MMS and camera with CM10. I think others can figure out the rest.
Yep, wondering myself if a JB TW STOCK ROM can be put on here.
I have the S3 on VZW and Stock w/ Root w/ Touch CWM. The only issue is since this is ICS and not JB yet, NFC doesn't work. (unless its just not working) Says something about it can't handle the file size in transfer.
We got it with a rebate for $330 what about you?
MrPeter1985 said:
Yep, wondering myself if a JB TW STOCK ROM can be put on here.
I have the S3 on VZW and Stock w/ Root w/ Touch CWM. The only issue is since this is ICS and not JB yet, NFC doesn't work. (unless its just not working) Says something about it can't handle the file size in transfer.
We got it with a rebate for $330 what about you?
Click to expand...
Click to collapse
Stock NFC can only handle small transfers like a contact card. S-Beam will allow you to transfers photos and video but of course this will only work between Samsung devices.
Sent from my SCH-I535 using Tapatalk 2
Stock NFC as in ICS? Whats different than ICS NFC and JB NFC? Because I can transfer anything else with my phone. Like normal 8mp images between other JB S3's and Note 2 with JB.
Is JB NFC updated or advanced?
EDIT: NVM dont know why NFC worked before without sbeam, turned on sbeam a second ago and even transferred a video.
In case people in this thread didn't know noobl did a good bit of work and got the camera working.
http://www.cricketusers.com/cricket...l]-cyanogenmod-10-1-nightly-builds-d2cri.html
We have nightlies now. I'll probably be selling the first ever Cricket GS3 with working camera soon lol.
Sent from my HTC6435LVW using Tapatalk 2
Does anyone have a link to download the stock rom?
There is one on cricketusers.com
Sent from my SCH-R530C using Tapatalk
(UPDATED)
Allinone Torrent file (root and flash):
Download (torrent): http://kat.ph/galaxy-s3-full-root-and-flashing-kit-rar-t7106750.html
Included's:
Root and unrooting file:
Samsung S3 Toolkit
Flashing Software:
QXDM 3.12 Build 714
QPST 2.7 Build 366
CDMA WORKSHOP 2.7 + Demo
DFS 4.3.1.0
Z4cell app (support us)
If you guys want official Mobile Odin support, can someone please download a copy of Mobile Odin (Free will work for this) and follow the prompts to do the dump to add? Upload that dump and link please so I can get to Chainfire.
Thanks to Shabbypenguin for his help so far on this issue. Now let's try to get it made official. Thanks!
Sent from my SPH-L900 using Tapatalk 2
1) is this thread for vzw flash to cricket, or cricket s3? Found in verizon forums, part but title slightly confusing.
2)if so, anyone point me to the place for a patch/method for getting the data connection off Verizon? Flashed with talk n txt, and 3G, but still getting verizon data network instead of cricket or sprint. Has to be something I have over looked. TUI
~SGSIII'ed runnin' Task AOKP
Why it's the a cricket thread in Verizon sub section
Sent from my SCH-I535 using Tapatalk 2
I would guess because XDa doesn't support less popular carriers. Therefore people place the threads in the models which share the most similarities.
You are all welcome to post on the other forum. The grass is greener for Cricket Users .
Sent from my SCH-I605 using Tapatalk 2
chrisngrod said:
I would guess because XDa doesn't support less popular carriers. Therefore people place the threads in the models which share the most similarities.
You are all welcome to post on the other forum. The grass is greener for Cricket Users .
Sent from my SCH-I605 using Tapatalk 2
Click to expand...
Click to collapse
Is MMS fixed in cm10.1 m2?
Cricket SCH-R530C Original Rom
Cricket SCH-R530C Original Rom
I have the original rom for the Cricket SCH-R530C, I can’t post the URL here as this is my first post but if you need the rom let me know and I’ll email you the link to the Gdrive location.
Scott
How do i get a hold of that?
Sent from my SCH-R530C using XDA Premium HD app
Hi,
I spent last night getting my t-mobile galaxy s4 to work on ATT. I did a lot of research on the subject and it wasn't that difficult at all. I bought the phone off of EBAY.
I was able to accomplish this from all of the tools here and a little research. http://forum.xda-developers.com/showthread.php?t=2335109
The first thing i did was root the phone and install CWM. I then used the sim unlock found in the link above. The next step i took (because i like custom roms on my phone) was to install TASK650's AOKP rom. I flashed the rom and followed his instructions.
After the restart, I went through the welcome screen and shut the phone down. I put my sim in and started the phone. I noticed i was getting the H, but no LTE. This led me to more research. The fix was easy once I found it. The APN needs to be pointed to the ATT phone option. It defaults to wap.cingular. After about 5 minutes and a reboot the LTE appeared and after the speed tests confirmed.
This is not a guide. I am just sharing my experience. If you do this please do your own research as you can do damage to your phone. There are risks involved, flash and modify your phone at your own risk.
Just wondering, why did you get a tmobile s4 to use with att? Normally the att version can be found for cheaper price
Sent from my GT-I9505
I am confused here, what is it you were trying to accomplish? running a att rom on your tmo device? Because you say you have a tmo phone.
Why go thru all that, when this rom is already setup to work on tmo with the tmo apn settings already setup for you.
[ROM] Task650 AOKP (Jellybean 4.2.2)(6.26.2013)
Do you new people just go and see a rom you like, in any forum, and do not look in your devices forum and flash it? if so, your are asking to brick your phones.
maldinimi said:
Just wondering, why did you get a tmobile s4 to use with att? Normally the att version can be found for cheaper price
Sent from my GT-I9505
Click to expand...
Click to collapse
Sadly he wants the unlocked boot loader that the T-Mobile s4 has I am miserable with my locked I337 .... also the T-Mobile variant has unlocked aws bands I had to flash something in my radio to get aws bands on T-Mobile using my AT&T s4
Sent from my GT-I9505G using xda premium
If you want an unlocked bootloader, can't you just install the custom recovery?
Sent from my SGH-I337 using xda app-developers app
klamse said:
If you want an unlocked bootloader, can't you just install the custom recovery?
Sent from my SGH-I337 using xda app-developers app
Click to expand...
Click to collapse
Doing so does not unlock it ..... just bypass it .. it's like wearing a police uniform but your not ...
Sent from my GT-I9505G using xda premium
Ok, so I know this isn't the I535 (verizon s3), but I have to ask.
I got the S3 from Straight Talk. It's running CDMA on Verizon. It says CDMA-V right on the box.
Now Ive had the I535 before and it was easy to find ROMS for the beast. But this, this SCH-S968C, I have never seen it and I cant find any
good sources to ROOT it. Or even find ROMs for it.
Any help would be great.
Many thanks! =)
jburke90 said:
Ok, so I know this isn't the I535 (verizon s3), but I have to ask.
I got the S3 from Straight Talk. It's running CDMA on Verizon. It says CDMA-V right on the box.
Now Ive had the I535 before and it was easy to find ROMS for the beast. But this, this SCH-S968C, I have never seen it and I cant find any
good sources to ROOT it. Or even find ROMs for it.
Any help would be great.
Many thanks! =)
Click to expand...
Click to collapse
What version of android does it have on it?
Sent from my A500 using xda app-developers app
Klown80 said:
What version of android does it have on it?
Sent from my A500 using xda app-developers app
Click to expand...
Click to collapse
Its 4.1.2. Here is a screenshot of all the important info.
jburke90 said:
Its 4.1.2. Here is a screenshot of all the important info.
Click to expand...
Click to collapse
To root Google impactor. It will get you rooted,sorry but no idea about custom ROMs.
Hope this helps!
jburke90 said:
Ok, so I know this isn't the I535 (verizon s3), but I have to ask.
I got the S3 from Straight Talk. It's running CDMA on Verizon. It says CDMA-V right on the box.
Now Ive had the I535 before and it was easy to find ROMS for the beast. But this, this SCH-S968C, I have never seen it and I cant find any
good sources to ROOT it. Or even find ROMs for it.
Any help would be great.
Many thanks! =)
Click to expand...
Click to collapse
as the post above said cydia impactor will root this phone in about 8 seconds .as far as the roms some people have been able to get the sch-i535 firmware to work but I don't know,all I can tell you is don't use ez unlocker to unlock the bootloader . also before you get to far make yourself the debrick image.otherwise you will be stuck with a hardbrick like me
---------- Post added at 01:18 AM ---------- Previous post was at 01:10 AM ----------
to make the debrick image go into adb shell or terminal emulator
and type this
su
dd if=/dev/block/mmcblk0 of=/sdcard/Unbrick.img bs=4096 count=50000
.p.s. if it works for you could you please send it my way.thanks .
Also backup your IMEI after you root. You must be rooted 1st
Sent from my SCH-I535 using Tapatalk
jburke90 said:
Ok, so I know this isn't the I535 (verizon s3), but I have to ask.
I got the S3 from Straight Talk. It's running CDMA on Verizon. It says CDMA-V right on the box.
Now Ive had the I535 before and it was easy to find ROMS for the beast. But this, this SCH-S968C, I have never seen it and I cant find any
good sources to ROOT it. Or even find ROMs for it.
Any help would be great.
Many thanks! =)
Click to expand...
Click to collapse
Be sure and Thank these guys, following their directions will save you a world of headaches later!! :good:
Hoew do I back up the IMEI and find the unbrick img
evertking said:
Hoew do I back up the IMEI and find the unbrick img
Click to expand...
Click to collapse
Be careful backing up IMEI. Do NOT try to unlock phone. If you do, it WILL hard brick.
Sent from my Transformer TF101 using Tapatalk
evertking said:
Hoew do I back up the IMEI and find the unbrick img
Click to expand...
Click to collapse
to get the unbrick image you will have to have your phone rooted,and superuser installed .then using adb shell(available in the android development tools bundle from google) or terminal emulator(from play store runs on your phone)in whichever you choose .you would the type su hit enter.grant root access .and then type
dd if=/dev/block/mmcblk0 of=/sdcard/Unbrick.img bs=4096 count=50000
If anyone needs the Odin file to restore back to stock ST let me know
Sent from my SCH-S968C using xda app-developers app
Rom for SCH-S968C
jburke90 said:
Ok, so I know this isn't the I535 (verizon s3), but I have to ask.
I got the S3 from Straight Talk. It's running CDMA on Verizon. It says CDMA-V right on the box.
Now Ive had the I535 before and it was easy to find ROMS for the beast. But this, this SCH-S968C, I have never seen it and I cant find any
good sources to ROOT it. Or even find ROMs for it.
Any help would be great.
Many thanks! =)
Click to expand...
Click to collapse
I have the SCH-S968C running on straight talk. I rooted it and installed the CleanRom found here ( http://forum.xda-developers.com/showthread.php?t=1904329 ) and it told me Insert sim for the longest time. I got a tracfone sim and cut it into the shape of a micro sim. I inserted it into my GS3 and everything works fine. It still says No Service on the notification bar but data, messaging and calling work. Hopefully this helps!
WesSmiley315 said:
I have the SCH-S968C running on straight talk. I rooted it and installed the CleanRom found here ( http://forum.xda-developers.com/showthread.php?t=1904329 ) and it told me Insert sim for the longest time. I got a tracfone sim and cut it into the shape of a micro sim. I inserted it into my GS3 and everything works fine. It still says No Service on the notification bar but data, messaging and calling work. Hopefully this helps!
Click to expand...
Click to collapse
You installed cleanROM? Can you got to about phone and send a screen shot of the build#, baseband.. Ect?
My phone is really a SCH-S968C but I installed the SCH-i535
WesSmiley315 said:
My phone is really a SCH-S968C but I installed the SCH-i535
Click to expand...
Click to collapse
Cool... So everything works? Have you tried any other TW ROMs?
evertking said:
Cool... So everything works? Have you tried any other TW ROMs?
Click to expand...
Click to collapse
I haven't tried any other roms but I can confirm everything works on it.
Stock
kenny1974 said:
If anyone needs the Odin file to restore back to stock ST let me know
Sent from my SCH-S968C using xda app-developers app
Click to expand...
Click to collapse
do you still know how to get back to stock if so please let me know
sch-s968c
WesSmiley315 said:
I have the SCH-S968C running on straight talk. I rooted it and installed the CleanRom found here ( http://forum.xda-developers.com/showthread.php?t=1904329 ) and it told me Insert sim for the longest time. I got a tracfone sim and cut it into the shape of a micro sim. I inserted it into my GS3 and everything works fine. It still says No Service on the notification bar but data, messaging and calling work. Hopefully this helps!
Click to expand...
Click to collapse
hey did everything work fine before the sim or did u have to get a sim to get it to work
WesSmiley315 said:
My phone is really a SCH-S968C but I installed the SCH-i535
Click to expand...
Click to collapse
can you tell me which recovery u use ?? please help me
Can someone please upload the odin file for this model? the dropbox link is not working anymore
is there still no way to convert vzw m8 intp a dev edition?
droidkill3r said:
is there still no way to convert vzw m8 intp a dev edition?
Click to expand...
Click to collapse
Unfortunately there's never been a way to convert the Verizon addition to a developer edition as far as I know. But with S OFF there is really no difference because the device is completely unlocked and you can do whatever you please with it.
Sent from my HTC6525LVW using Tapatalk
flyinj54 said:
Unfortunately there's never been a way to convert the Verizon addition to a developer edition as far as I know. But with S OFF there is really no difference because the device is completely unlocked and you can do whatever you please with it.
Sent from my HTC6525LVW using Tapatalk
Click to expand...
Click to collapse
Yes true but wouldn't I be able to get firmwares early from HTC and not Verizon.. And ty you for responding
droidkill3r said:
Yes true but wouldn't I be able to get firmwares early from HTC and not Verizon.. And ty you for responding
Click to expand...
Click to collapse
You make a good point that would be a benefit. But honestly I've never seen a way to do the conversion on a verizon phone
Sent from my HTC6525LVW using Tapatalk
droidkill3r said:
Yes true but wouldn't I be able to get firmwares early from HTC and not Verizon.. And ty you for responding
Click to expand...
Click to collapse
BTW I'm using a unofficial cm12 and its working great so far
droidkill3r said:
BTW I'm using a unofficial cm12 and its working great so far
Click to expand...
Click to collapse
Can you link me to the exact one that you are running currently? I installed the 1122 build yesterday and everything was fine until I rebooted the ROM and I lost data completely and was unable to get it back. I heard of a few others complaining of the same issue. Have you tried to reboot your phone and see if data still working with wifi off? If so and it is please link me to it exactly which version you're running thanks
Sent from my HTC6525LVW using Tapatalk
flyinj54 said:
Can you link me to the exact one that you are running currently? I installed the 1122 build yesterday and everything was fine until I rebooted the ROM and I lost data completely and was unable to get it back. I heard of a few others complaining of the same issue. Have you tried to reboot your phone and see if data still working with wifi off? If so and it is please link me to it exactly which version you're running thanks
Sent from my HTC6525LVW using Tapatalk
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2949682 that's the one I'm on and yes just rebooted with WiFi off and my data worked
droidkill3r said:
http://forum.xda-developers.com/showthread.php?t=2949682 that's the one I'm on and yes just rebooted with WiFi off and my data worked
Click to expand...
Click to collapse
Thank you sir I'll give it a shot right now.
Sent from my HTC6525LVW using Tapatalk
---------- Post added at 11:37 PM ---------- Previous post was at 11:35 PM ----------
http://rootzwiki.com/topic/649633-rom-vanillipop-10-11152014-vanilla-android-lollipop-50/
If you want to try GPE Android lollipop build that is very fast and stable try this out. Been running it for around four days now and the battery life and stability is amazing.
Sent from my HTC6525LVW using Tapatalk
flyinj54 said:
Thank you sir I'll give it a shot right now.
Sent from my HTC6525LVW using Tapatalk
Click to expand...
Click to collapse
If it don't work try digitalhigh ROM. Shot me a message I'll send a link
droidkill3r said:
If it don't work try digitalhigh ROM. Shot me a message I'll send a link
Click to expand...
Click to collapse
I've tried out his latest lollipop ROM and I'm having a lot better speed and battery life with the link I sent you. Not sure why just likes my device a lot better I guess
Sent from my HTC6525LVW using Tapatalk
flyinj54 said:
I've tried out his latest lollipop ROM and I'm having a lot better speed and battery life with the link I sent you. Not sure why just likes my device a lot better I guess
Sent from my HTC6525LVW using Tapatalk
Click to expand...
Click to collapse
That's the ROM I came from "gpe" and that was the link I was gonna sent you not digital high
droidkill3r said:
That's the ROM I came from "gpe" and that was the link I was gonna sent you not digital high
Click to expand...
Click to collapse
OK gotcha. Guess were on the same page then. You using the cm12 as your daily driver then?
Sent from my HTC6525LVW using Tapatalk
I installed it a hour ago. No problems yet
I have been wanting to convert mine to a dev for a long time, and there are two different posts out on the m8 forum for this but they only work for the gsm versions such as international, tmobile and at&t. And I"am sure there has to be a way for our verizon m8 its just finding it, as ours is a world phone being both cdma and gsm, even if it had to only run on the gsm side it could still work if they get the volte update pushed out as part of L then there would be no need for cdma for us and we could just totally run off verizon lte which is actually gsm.
So this may be a possibility in the near future especially. I myself not only want the updates directly from htc which are faster but I would prefer to never ever again have to run verizon software / firmware because all verizon wants to do is lock us all out.
At least all the other carriers allow htc dev to unlock the bootloaders but verizon just likes to be total asses about this, I guess they think they are too big for there britches, for this exact reason I really wish I could switch to at&t but I dont have coverage for them at home with zero bars maybe some edge coverage 1% of the time never enough to use the phone on, and verizon is not much better with only getting 1x data and no plans to upgrade.
So I"am with all of you on this I would like to convert my verizon m8 to dev also and ditch verizon having any control over my phone ever again, as I pay them for service and not to try to lock down my phone which I"am supposed to legally own with honoring my side of the their 2 year contract.
But for that matter you can buy a phone at full retail price and they still try to lock you down.
---------- Post added at 04:30 AM ---------- Previous post was at 04:28 AM ----------
droidkill3r said:
is there still no way to convert vzw m8 intp a dev edition?
Click to expand...
Click to collapse
See my last post right before this one, as I should have replied on your opening.
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.