Galaxy S4- Verizon Phone Being Used On T-Mobile - T-Mobile Samsung Galaxy S 4

Help with Galaxy S4 -Verizon to T-Mobile
Hello, I have been reading through these forums and am starting to feel a bit of hope. I have a unlocked Samsung Galaxy S4 that I purchased from a friend who is a Verizon customer. I am using T-Mobile (Family Mobile...same thing?). The phone works with the T-Mobile SIM card however, the data is sketchy and the Text Messaging works some of the time, but does not work most of the time. I live in a Metropolitan area with excellent coverage. In fact, my wife and children have no problems with T-Mobile service; however, their phones were originally configured for T-Mobile. I can't say for certain, but it seems like the radio's are either incompatible or that they are configured incorrectly for T-Mobile.
I have never modified a phone's OS or ROM before, but I am familiar with the concepts and I am not afraid. Is there a custom ROM that can be flashed to get all traces of Verizon off of this phone? And can I configure it so that it is optimized for the T-Mobile networks?
Thanks in advance for your help!
Here is some info about the phone:
Model: SCH-I545
Android Version: 5.0.1
Baseband: I545VRUG0C1
Kernel: 3.4.0
Build No: LRX22C.I545VRUG0C1
Hardware Version: I545.06
KNOX: 2.3
Configuration Version: J12.SAM.SCHI545.0

Related

[Q] How to get a verizon sim to work on a at&t samsung galaxy s3

How to get a verizon sim card to work on a at&t samsung Galaxy s3.
Can I make ATT Samsung Galaxy S3 work on a verizon sim card?
The phone is rooted and unlocked.
SAMSUNG-SGH-I747
Android version 4.1.2
Baseband version 1747ucdmg2
build # Supreme Deadly Venom v7.1.0
getyasome said:
How to get a verizon sim card to work on a at&t samsung Galaxy s3.
Can I make ATT Samsung Galaxy S3 work on a verizon sim card?
The phone is rooted and unlocked.
SAMSUNG-SGH-I747
Android version 4.1.2
Baseband version 1747ucdmg2
build # Supreme Deadly Venom v7.1.0
Click to expand...
Click to collapse
Unfortunately, can't be done as Verizon uses CDMA and ATT uses GSM. Means radios are completely different.
getyasome said:
How to get a verizon sim card to work on a at&t samsung Galaxy s3.
Can I make ATT Samsung Galaxy S3 work on a verizon sim card?
The phone is rooted and unlocked.
SAMSUNG-SGH-I747
Android version 4.1.2
Baseband version 1747ucdmg2
build # Supreme Deadly Venom v7.1.0
Click to expand...
Click to collapse
impossible until the carriers and technology says so, sorry CDMA+GSM dont mix unless they say so
getyasome said:
How to get a verizon sim card to work on a at&t samsung Galaxy s3.
Can I make ATT Samsung Galaxy S3 work on a verizon sim card?
The phone is rooted and unlocked.
SAMSUNG-SGH-I747
Android version 4.1.2
Baseband version 1747ucdmg2
build # Supreme Deadly Venom v7.1.0
Click to expand...
Click to collapse
What all have u tried so far? I have a friend with a verizon droid dna running a straight talk (at&t) sim, and everything works, calls, text, mms, and internet...
DMF1977 said:
What all have u tried so far? I have a friend with a verizon droid dna running a straight talk (at&t) sim, and everything works, calls, text, mms, and internet...
Click to expand...
Click to collapse
As stated above, Verizon and att use two entirely different networks. The radio hardware is different. Unless the droid dna is a gsm phone that should not be possible.
Sent from my Galaxy Nexus using xda app-developers app
Greycloak42 said:
As stated above, Verizon and att use two entirely different networks. The radio hardware is different. Unless the droid dna is a gsm phone that should not be possible.
Sent from my Galaxy Nexus using xda app-developers app
Click to expand...
Click to collapse
I'm fully aware that they are entirely different networks, but it works. Yes, the verizon dna is cdma, but it also takes a sim card, im assuming because of the 4g lte...
DMF1977 said:
I'm fully aware that they are entirely different networks, but it works. Yes, the verizon dna is cdma, but it also takes a sim card, im assuming because of the 4g lte...
Click to expand...
Click to collapse
That phone is also GSM capable. At that point it's all a matter of the APN settings. It can not be done with the S3 on any carrier (swapping from CDMA to GSM)
getyasome said:
How to get a verizon sim card to work on a at&t samsung Galaxy s3.
Can I make ATT Samsung Galaxy S3 work on a verizon sim card?
The phone is rooted and unlocked.
SAMSUNG-SGH-I747
Android version 4.1.2
Baseband version 1747ucdmg2
build # Supreme Deadly Venom v7.1.0
Click to expand...
Click to collapse
I think you can get the Verizon S3 to work on AT&T (calls/text/edge data). I know you can do that on T-Mobile. But you won't be able to get the AT&T S3 to work on Verizon for two reasons;
1) The radio would need to be hacked to enable the CDMA radio, and the information needed to hack the radio is not available. The US variants all received the same radio chip, just some of the frequencies are turned off. For instance, the AT&T S3 wasn't able to get the t-mobile AWS band working until the guy working for t-mobile released some radio files. The AT&T/T-Mo S3s have the CDMA radio, but it's not enabled
2) Verizon won't allow the phone on the network, as the IMEI is not registered on their network. This is probably the most important reason. You would need to spoof the IMEI from another verizon phone, which is not something that can be discussed here.
You are better off switching with someone who has a Verizon S3, that wants an AT&T S3.
tokuzumi said:
I think you can get the Verizon S3 to work on AT&T (calls/text/edge data). I know you can do that on T-Mobile. But you won't be able to get the AT&T S3 to work on Verizon for two reasons;
1) The radio would need to be hacked to enable the CDMA radio, and the information needed to hack the radio is not available. The US variants all received the same radio chip, just some of the frequencies are turned off. For instance, the AT&T S3 wasn't able to get the t-mobile AWS band working until the guy working for t-mobile released some radio files. The AT&T/T-Mo S3s have the CDMA radio, but it's not enabled
2) Verizon won't allow the phone on the network, as the IMEI is not registered on their network. This is probably the most important reason. You would need to spoof the IMEI from another verizon phone, which is not something that can be discussed here.
You are better off switching with someone who has a Verizon S3, that wants an AT&T S3.
Click to expand...
Click to collapse
It will work with T-Mobile because it's a GSM network. The radio can't be hacked. It's a limitation of the hardware itself. It's 2 completely different pieces of hardware.
The sim card on Verizon phones is ONLY used to access Verizon's LTE, without that simcard you'd have regular 4G only on a Verizon phone. That sim card/or phones acts in no way possible as GSM accessible.
So no it will NEVER work regardless of what you do.
And don't fall for ads on the internet about any Verizon,Sprint, or any CDMA phone to work on GSM networks.
jayRokk said:
The sim card on Verizon phones is ONLY used to access Verizon's LTE, without that simcard you'd have regular 4G only on a Verizon phone. That sim card/or phones acts in no way possible as GSM accessible.
So no it will NEVER work regardless of what you do.
And don't fall for ads on the internet about any Verizon,Sprint, or any CDMA phone to work on GSM networks.
Click to expand...
Click to collapse
This is not entirely true for all Verizon phones. The DNA, S4, Note 2, LG G2 (among others) are sim-unlocked out of the box, and will work with AT&T/T-Mobile (the note 2 requires some hacking in order to add the APN settings). Also, as I recall, if I took the sim card out of my GNex and DNA, I did not have service. It would only allow for emergency calls. No talk/text/2G/3G.
For the Galaxy Nexus, the phone is 100% guaranteed to not work on any GSM network.
tokuzumi said:
This is not entirely true for all Verizon phones. The DNA, S4, Note 2, LG G2 (among others) are sim-unlocked out of the box, and will work with AT&T/T-Mobile (the note 2 requires some hacking in order to add the APN settings). Also, as I recall, if I took the sim card out of my GNex and DNA, I did not have service. It would only allow for emergency calls. No talk/text/2G/3G.
For the Galaxy Nexus, the phone is 100% guaranteed to not work on any GSM network.
Click to expand...
Click to collapse
Read the first sentence
"Only to get Verizon's LTE"
Unlocked phones work "globally"
Which means you'd get Voice and EDGE/3G at the most from other GSM networks, given you've provided the correct APNs. Locked phones, which carry that sim card for Verizon's LTE ONLY. Either way only a few phones will work. The rest are useless.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Agent said:
It will work with T-Mobile because it's a GSM network. The radio can't be hacked. It's a limitation of the hardware itself. It's 2 completely different pieces of hardware.
Click to expand...
Click to collapse
No. They use the same hardware. Msm8960. It should support GSM CDMA WCDMA LTE and Td-scdma. Almost all the network. It's mostly because of the lock of the radio/nv.
Remember, the op is asking if he can use an at&t galaxy s3 on Verizon. It's not going to work.
IT WORKS
tokuzumi said:
I think you can get the Verizon S3 to work on AT&T (calls/text/edge data). I know you can do that on T-Mobile. But you won't be able to get the AT&T S3 to work on Verizon for two reasons;
1) The radio would need to be hacked to enable the CDMA radio, and the information needed to hack the radio is not available. The US variants all received the same radio chip, just some of the frequencies are turned off. For instance, the AT&T S3 wasn't able to get the t-mobile AWS band working until the guy working for t-mobile released some radio files. The AT&T/T-Mo S3s have the CDMA radio, but it's not enabled
2) Verizon won't allow the phone on the network, as the IMEI is not registered on their network. This is probably the most important reason. You would need to spoof the IMEI from another verizon phone, which is not something that can be discussed here.
You are better off switching with someone who has a Verizon S3, that wants an AT&T S3.
Click to expand...
Click to collapse
i can verify that i an running AT&T straight talk service on my sch-i535 (Verizon Galaxy s3)
I have had success using a Verizon sg3 mother board on att's network although I was only able to get 2g. What I did was rooted phone, ran region unlock app, next I let the phone sit for a day, then a did a factory reset from the phones menu not custom recovery. Then when going through the set up wizard it prompted me to insert sim card then it said it was not an approved sim and gave options to continue or finish, selected finish, said complete and about 3-5 mins after booting up I got signal bars and phone was working. Although the hardware used are different these are dual band phones.
Never give up keep trying
Sent from my SAMSUNG-SGH-I747 using XDA Premium 4 mobile app

[Q] Is there difference between N5120 & SGH-i467M

Just bought a used Note 8 with LTE. I thought that was a N5120, but in the ABOUT section it calls it an SGH-i467M.
What do I have?
Thank you
Goto: Settings -> About device -> Model number, and it will answer your question .
As far as I know the only difference between GT-N5120 and SGH-i467M is that SGH-i467M is the model number used by AT&T in the USA and Roger's in Canada. But take that with a grain of salt -- I'm a GT-N5110 (Wi-Fi) owner.
Spidey01 said:
Goto: Settings -> About device -> Model number, and it will answer your question .
As far as I know the only difference between GT-N5120 and SGH-i467M is that SGH-i467M is the model number used by AT&T in the USA and Roger's in Canada. But take that with a grain of salt -- I'm a GT-N5110 (Wi-Fi) owner.
Click to expand...
Click to collapse
Thanks Spidey01. I hear conflicting things, some say I will brick it if I use the 5120 ROM (4.2.2) and some like you say it's a name. Not ready to take a chance yet.
You might be able to ask your national branch of Samsung support but I'm honestly not sure they would know the difference. Their websites not very clear as far as I know. Here in the USA, it's classified as the SGH-I467ZWAATT for the LTE model and AT&T only.
They offer the Note 10.1 2014 on 2 out of 4 major carriers (T-Mobile, VZW) and the Note Pro 12.2 on 2 out of 4 major carriers (AT&T, VZW).
When I bought my Note 8, I went with the Wi-Fi only GT-N5110 because the 3G based GT-N5100 cost an too much via Amazon, darn imports.
Spidey01 said:
You might be able to ask your national branch of Samsung support but I'm honestly not sure they would know the difference. Their websites not very clear as far as I know. Here in the USA, it's classified as the SGH-I467ZWAATT for the LTE model and AT&T only.
They offer the Note 10.1 2014 on 2 out of 4 major carriers (T-Mobile, VZW) and the Note Pro 12.2 on 2 out of 4 major carriers (AT&T, VZW).
When I bought my Note 8, I went with the Wi-Fi only GT-N5110 because the 3G based GT-N5100 cost an too much via Amazon, darn imports.
Click to expand...
Click to collapse
hmmm for a moment I had to look that 5120 model up. I see that it is the 3G, 4G/LTE, Wifi version. I only have the 5110 Wifi version.
Anyway, according to Samsung you have the AT&T US version.
TS
twospirits said:
hmmm for a moment I had to look that 5120 model up. I see that it is the 3G, 4G/LTE, Wifi version. I only have the 5110 Wifi version.
Anyway, according to Samsung you have the AT&T US version.
TS
Click to expand...
Click to collapse
Yup. It's a basterdized version of the 5120. There is no microphone, can't use any voice programs. They didn't want people using it to make phone calls. You wonder why I hate Rogers.
But I've also heard that if you try to put a 5120 ROM on, even if you use the Rogers LTE radio, you will brick it. Pretty sad. And they won't update it from the original 4.1.2.
harry_fine said:
Yup. It's a basterdized version of the 5120. There is no microphone, can't use any voice programs. They didn't want people using it to make phone calls. You wonder why I hate Rogers.
But I've also heard that if you try to put a 5120 ROM on, even if you use the Rogers LTE radio, you will brick it. Pretty sad. And they won't update it from the original 4.1.2.
Click to expand...
Click to collapse
No Microphone! hmm Well I guess I can cross out that model off my list. In another thread I mentioned that I plan on selling my wifi version and get the AT&T version and use it on T-Mobile but if there is no microphone than like you said, you can't make calls.
Guess I will have to get either the more expensive international version GT-N5100 or GT-N5120.
TS
Just a point of clarification, there are several differences between the N5100 and i467 that make it unsuitable as a primary phone. Besides the lack of a microphone, there's no ear speaker. Most importantly, there is no phone app, and nobody has been able to develop one that works reliably (there's a thread dedicated to this topic). So calls on an i467 would be VoIP.
Lastly, the N5120 is not well suited for the US, it has different frequency bands than the N5100. If you're using AT&T's or T-Mobile's network, get the i467 or the N5100, there is no advantage to getting the N5120.
http://www.samsung.com/hk_en/support/model/GT-N5120ZWATGY-techspecs
http://www.samsung.com/latin_en/consumer/mobile-phones/galaxy-note/galaxy-note/GT-N5100ZWLTPA-spec
http://www.samsung.com/us/mobile/galaxy-tab/SGH-I467ZWAATT-specs
afblangley said:
Just a point of clarification, there are several differences between the N5100 and i467 that make it unsuitable as a primary phone. Besides the lack of a microphone, there's no ear speaker. Most importantly, there is no phone app, and nobody has been able to develop one that works reliably (there's a thread dedicated to this topic). So calls on an i467 would be VoIP.
Lastly, the N5120 is not well suited for the US, it has different frequency bands than the N5100. If you're using AT&T's or T-Mobile's network, get the i467 or the N5100, there is no advantage to getting the N5120.
http://www.samsung.com/hk_en/support/model/GT-N5120ZWATGY-techspecs
http://www.samsung.com/latin_en/consumer/mobile-phones/galaxy-note/galaxy-note/GT-N5100ZWLTPA-spec
http://www.samsung.com/us/mobile/galaxy-tab/SGH-I467ZWAATT-specs
Click to expand...
Click to collapse
How would you make VoIP calls with no microphone?
I don't have the i467, but I assume calls can be made using a headset. Prior to the N5100, I had a Tab 7.7 and made calls via VoIP using the speakerphone or bluetooth headset.
Sent from my GT-N5100 using XDA Free mobile app
harry_fine said:
How would you make VoIP calls with no microphone?
Click to expand...
Click to collapse
Use an external microphone, i.e. 3.5mm or Bluetooth headset.
I467 has a mic
harry_fine said:
Yup. It's a basterdized version of the 5120. There is no microphone, can't use any voice programs. They didn't want people using it to make phone calls. You wonder why I hate Rogers
But I've also heard that if you try to put a 5120 ROM on, even if you use the Rogers LTE radio, you will brick it. Pretty sad. And they won't update it from the original 4.1.2.
Click to expand...
Click to collapse
There is a mic in the AT&T SGH-I467 Note 8. Just that it has no radio for voice communication. I use Skype to make phone call voice over ip. I should wish AT&T is not all the users of this model. They have consistently delay the release of any Android updates since 4.1.2
tabletnewbie said:
There is a mic in the AT&T SGH-I467 Note 8. Just that it has no radio for voice communication. I use Skype to make phone call voice over ip. I should wish AT&T is not all the users of this model. They have consistently delay the release of any Android updates since 4.1.2
Click to expand...
Click to collapse
Doncha love the info peeps put out about the I467 model. Makes me wonder who to trust on these threads.
I have an AT&T model right now in the UK doing very well mind you... VOIP works using Text Plus.
Just have to sort out blasted SIM cards. As Britain does not play well with Belgium and Belgium does not play well with Holland. Like You need a SIM for every country in Europe. Bloody hell!!!!
harry_fine said:
How would you make VoIP calls with no microphone?
Click to expand...
Click to collapse
The AT&T SGH-I467 has a microphone and places VoIP calls superbly. I use it all the time. Please people. Do some research before presenting information that is not correct (i'm not saying your post was incorrect harry_fine). Incorrect info (models, specs, so forth) pollutes the threads and adds confusion to some already confusing topics for new users. -smiles-
Comparison
The following page may serve as a comparison between GT-N5100 and SGH-i467:
phonemore.com/compare/phones/samsung-galaxy-note-80-gt-n5100-16gb-vs-samsung-galaxy-note-80-4g-sgh-i467-16gb/814727
However it concludes that i467 is better than N5100 as the former is 4G LTE supported while the latter is 3G only. Dont know how much credibility in that.
harry_fine said:
How would you make VoIP calls with no microphone?
Click to expand...
Click to collapse
If there is no microphone, how does the camera record with sound? Look directly above the power button, you will find the microphone (at least on the I467)
I know this is an old thread, but since no one has responded to my new thread, I will ask my question here.
I have an I467 (yes, it has a mic, but NO phone app. You use VOIP instead) that needs an LCD/digitizer replacement.
The price of this assembly is quite high if it is advertised specifically for I467. I guess they are the Samsung OEM part.
The LCD/digitzer for N5100 or N5110 are cheaper. However, will they work on I467? Many sellers on eBay claim their LCD/digitizer will work for *BOTH* N5110 and I467 because they think I467 is Wi-Fi only too just like N5110. This is obviously a mistake. I467 is 4G LTE. I have it working in my hand!
However, since LCD/digitizer is not a function related to radio, just because N5100 is 3G, it doesn't mean its LCD would work on I467. Likewise just because N5110 is Wi-Fi only, it doesn't mean the display won't work on I467. I see it more like a mechanical fitting issue. Does anyone know for sure?
Lastly, does N5120 have the exact same hardware as I467 but differ only in software (e.g it has been programmed with different frequency bands)?
p.s. unrelated subject but a hard learned lesson to share. I467 (AT&T) has a locked bootloader. My understanding is I467M (note the ending -M) is the Canadian version, which is not locked, but I am not sure. Now this bootloader is so restricted that even if you download a STOCK ROM specifically for I467 (AT&T) posted online, it can still brick the phone! It happened to my first I467. I got a message saying software not authorized by AT&T has been detected, but it was an I467 *STOCK* ROM! Obviously AT&T has several different I467 ROMs, and those online resources do NOT have all revisions. Unless you put the same revision that you get from OTA or Samsung Kies, the bootloader would still reject it.
SGH-I467 is the AT&T version. SGH-I467M (note the ending M) is the Canadian version. Many people are mixing these two, but the difference can get you!
The AT&T version has the bootloader locked, but the Canadian version is UNLOCKED.
It is very easy to root SGH-I467M but much harder with an SGH-I467!
With a locked bootloader, I had to try many different tools and finally was able to root with Kingo Root (not Kingroot).
GT-5120 has an earpiece and proximity sensor. SGH-I467 does NOT. I don't know if SGH-I467M has these 2 hardware since mine is SGH-I467.
Although all 3 are LTE, since GT-5120 is an international version, it wouldn't have the same frequency bands as SGH-I467 or SGH-I467M.
Spidey01 said:
Goto: Settings -> About device -> Model number, and it will answer your question .
As far as I know the only difference between GT-N5120 and SGH-i467M is that SGH-i467M is the model number used by AT&T in the USA and Roger's in Canada. But take that with a grain of salt -- I'm a GT-N5110 (Wi-Fi) owner.
Click to expand...
Click to collapse
SGH-I467 is AT&T (no ending M), but SGH-I467M is made for the Canadian carriers.
Though they are almost identical, they do have one vital difference. SGH-I467 has the bootloader LOCKED while SGH-I467M does NOT.
Since both SGH-I467M and GT-N5120 have unlocked bootloader, I was thinking about buying a GT-N5120 motherboard and swapping it into my SGH-I467. I wasn't planning on buying a SGH-I467M motherboard because I couldn't find them. Though GT-N5120 has international frequency bands not available in the U.S., with an unlocked bootloader, I thought I could just swap in my carrier's, T-Mobile, modem code.
Now I don't think it is doable at all. I have a Canadian Galaxy S4, SGH-I337M (bootloader unlocked, unlike the AT&T version). I tried to download T-Mobile's modem to my S4 thinking it may give me better data rate. Odin prompted Fail! (Auth) and S4 showed Secure Check Fail! After some googling, I realize regardless of unlocked bootloader, these phones/tablets are engineered to check if authorized modem codes are being flashed. I know for sure my S4's bootloader is unlocked because I have installed TWRP for recovery.
Since GT-N5120 has international frequency bands, turning it into a North American tablet is DOA if another carrier's modem code cannot be installed. If anyone questions why a custom ROM can be flashed to a phone/tablet with unlocked bootloader, it is because a custom ROM seldom comes with the modem code!

[Q] USC Samsung Galaxy S4 Mini (SCH-R890) Network Unlocking Help

I have been searching for the last 2 days for information on how to network unlock my phone seeing as how the local "flashing" store can not unlock my phone.
My phone has been rooted and uses the CWM recovery mod.
Here is some information about the phone
Brand: Samsung
Model: SCH-R890
Build: KOT49H.R890TYUBNK1
Hardware Version: R890.02
Android Version: 4.4.2
I have tried using the "dialer code" method, and none of them pull any kind of menu up, even the basic "dialer code" to show the IMEI number does not work, I have read that it only works with version 4.2.2, and I have checked samsung-updates, and sammobile and neither of them offer firmware for 4.2.2 only 4.4.2 which leaves me in the same boat.
The phone does not have any custom rom and was bought brand new from US Cellular.
I DO NOT meet the eligibility of US Cellular to receive the proper unlock code from them, so that leaves me no where else to turn.
I have spent hours searching forums, and have found countless threads about other Galaxy S4 Mini models other than what I have.
I am looking for any and all suggestions that I have not already explored as I am growing irritated looking amongst everything with no hints or clues as to what I need to look for.
If anyone could be of some assistance it would be greatly appreciated.
If I'm not allowed to do this please delete this post.
Bump
Sent from my SCH-R890 using XDA Free mobile app
Did they sell you the SCH-R890 with the custom recovery on it?
What will a network unlock do for you?
This phone can already run custom without any unlocking.
If you want to unlock - make sure this phone is compatible with your desired carrier network. I have the same phone. A relative upgraded her phone and gave me this EXACT phone. I wanted to unlock and use my current carrier (T-mobile). The info I found was that THIS phone is NOT compatible with T-mobile's tower network.
T-mobile uses a GSM tower antenna network and this phone ONLY OPERATES on a CDMA or LTE tower antenna network. To find what antenna network your phone operates on go to Settings-->Connections Tab-->More networks-->Mobile Networks-->Network mode. In Network mode you'll find this phone only operates on the CDMA or LTE.

Can a T-Mobile Samsung Galaxy Note 3 (N900T) work with Sprint after unlocking?

Hello,
I recently joined Sprint's network. I am aware that their phones are CDMA-based, unlike T-Mobile's and ATT's, which are GSM-based.
My mother has a Note 3 in good condition that she is getting rid of, and I'd like to keep it; but it's a T-Mobile model, and have been trying to find info. about whether or not the phone can be made to work in Sprint's network after unlocking it.
Any information is greatly appreciated.
No, 2 different types of radios. work with any GSM based carrier like T Mobile AT&T etc but not sprint
should work in 2020 as sprint is now owned by tmobile

Galaxy S9 SM-G960U what did I get myself into?

Hi all, new here and phone ignorant.
My parents wanted new phones this past Christmas and they like Samsungs. They had Galaxy S3's and so I bought them 2 new Galaxy S9's, model SM-G960U1. They worked great out of the box. I moved over their ATT Straight Talk sims and they have had no issues. They live out in the country and these phones get great reception.
Fast forward to last week I decided to order the same for myself. The phone that arrived was a Galaxy S9 model SM-G960U. I stuck in my ATT Straight Talk SIM and at first thought everything was OK. But, then realized the phone is missing Volte, wifi calling, and gets horrible data coverage and very weak voice service in the country.
Is there anything I can do to fix this, like flash the firmware? Am I stuck with it? Should I try returning it?
Thanks!
Flash it to U1 (unlocked) as your phone currently has "U" firmware (originally carrier locked). Read this thread to see how: https://forum.xda-developers.com/galaxy-s9/how-to/how-to-flash-u1-firmware-to-device-t3765200 . My S9 is an AT&T variant and I flashed it to The unlocked US variant and I use it on Simple Mobile. Wifi calling works, cellular data and cell signal - everything works perfectly.

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