[Help] Unlocked AT&T S9+ for VZW - Samsung Galaxy S9+ Questions & Answers

I bought a used S9+ from AT&T got it unlocked, and then installed the firmware via Odin for VZW I found online, but it still wont work.
I installed a radio switcher app and managed to at least get the LTE data working, but the phone+SMS doesn't work at all, and its showing no service (no bars), but the LTE data works perfectly. Anyone know how to get this phone to work on Verizon? I have spent almost 2 weeks trying and no luck

Related

[Q] Verizon S4 tries to activate on AT&T

UPDATE:
Fixed the problem but putting CM10.1 on the device and changing the cdma subscription to SIM
I bought a Verizon S4 from swappa that had been rooted and unlocked and used on the AT&T network. With a factory reset I couldn't get my sim to work in the phone and so I used Odin to completely restock my device to stock everything. I took it to Verizon and after a couple of hours of trying to figure this thing out they confirmed that it was not attempting to connect to Verizon but AT&T.
Anyone have any idea how I can make it try Verizon instead? I was thinking I'd be rooting it again but I'm pretty lost.

[Q] Data stopped working on Verizon S4 with AT&T sim?

Hello everyone, I bought a Verizon S4 a little over a week ago. I put in my ATT simcard and it worked fine. I added the ATT APN settings and it worked. I was getting 4g. A few days ago, I was trying to see what LTE speeds I can get in my area, so I put it in my Note 2. It worked, I put it back into my S4. That's when the Data stopped working. I scrutinized my APN settings and nothing worked. I talked to ATT tech support and they don't know either. The data works on my Note. And the weird thing is I'm still able to receive MMS without wifi/data. Can any of you help me? I'd be utterly grateful! Thanks!

Bought a new US S9+ 256gb Unlocked and TMobile LTE is Slow/No Connection.

Hi all, I just bought a new Samsung S9 plus 256gb US version unlocked from Samsung's website and I have TMobiles unlimited one plan. The Sim card I got was in my old ZTE Blade V8 Pro unlocked (you can probably guess why I bought a new phone). After putting the SIM card in the new phone for about a few hours it was a night and day difference where places I tested my LTE speed was 30mbs verses 6-8 on the old phone and the internet loaded quicker.
However, later in the day I started getting no connection or slow speeds and sometimes got edge+ connections in places where even my crappy V8 Pro would get connections. I called TMobile and gave them my phone's emei number and the Sim number that I used. At first it worked better but I still get less bars of reception and there are times when it takes a while for a LTE connection when there is no wifi. I even get LTE+ and it will still load some things like twitch streaming slow.
Someone suggested flashing TMobile firmware to the phone to try help connecting to their network like their branded phone's, but I have no idea what file to download for TMobile firmware for Odin to flash. Also, would it help to get updates from TMobile faster? People who have a TMobile sold S9+ are getting the new delayed update but my unlocked phone isn't. Thanks for your time.
I can say with a great deal of confidence that flipping firmware will not resolve this problem. It sounds like a hardware issue to me.

s9+ MMS question

Hello,
i purchased a s9+ the other day on Craigslist, its originally from sprint and the guy said it was unlocked, i popped my t-mobile sim in and its been working fine (ive texted, called and used date) although i haven't seen it go to LTE and today i noticed that i cant send any MMS, is there a firmware i need to flash? ive already made sure that the APN was set to T-Mobile US LTE, also if i can get rid of the preinstalled sprint bloatware that would be great, especially since i cant use them
Any help would be appreciated

I have an unlocked S9+ originally from T-Mobile. WiFi Calling is gone.

OK, so I was with T-Mobile forever, and I bought this phone from them at launch. I decided to switch over to MetroPCS by T-Mobile because it's cheaper, so I paid off my phone then unlocked it (Even though I didn't need too, the Metro SIM worked in it before I unlocked it).
It worked fine for two weeks, and I had WiFi calling and everything, and then the RJ5 (I believe?) update came out, and when my phone booted up it said new sim detected, and WiFi calling was gone. My APN settings were set to MetroPCS', so I set it back to the T-Mobile one since it's essentially the same network, but the WiFi calling option is *completely* gone; it's not there, trust me. I call MetroPCS support and they said they can't enable it for devices that weren't bought from them, and I tried to argue like sure you can, send it up to a higher level support team, but I could hardly understand her and gave up.
I went into a MetroPCS store and they had a spare T-Mobile SIM, popped it in, boom WiFi calling was back.
Come OneUI Pie update one, I opt in and update, and voila, WiFi calling is back!
I just downloaded the second update last night, and now it's gone again. This **** is driving me crazy, if anyone can help me figure out a way to fix this I will love you forever.
Wow, that was a gripping good yarn! I think there's a good chance that if you switch to the unlocked G965U1 firmware, it might work. I have an unlocked Verizon S9+ running on TMO, and once I flashed it to U1, wifi calling and volte worked automatically. I'm not positive how it will be with Metro but it is worth looking into. When you flash the collect unlocked firmware, when the phone boots up it will detect your sim and then reboot and configure all the settings for you.
P.S. I don't suppose there's Metro firmware out there?
I don't think there's Metro firmware, because my updates still come from T-Mobile. T-Mobile owns Metro. So what you're saying is flash the firmware via Odin and my phone would be like truly unlocked and I would get updates from Samsung rather than T-Mobile? I don't want to go through all this if it isn't a a certain fix, but sadly there's no way to tell that.
YrrchSebor said:
Wow, that was a gripping good yarn! I think there's a good chance that if you switch to the unlocked G965U1 firmware, it might work. I have an unlocked Verizon S9+ running on TMO, and once I flashed it to U1, wifi calling and volte worked automatically. I'm not positive how it will be with Metro but it is worth looking into. When you flash the collect unlocked firmware, when the phone boots up it will detect your sim and then reboot and configure all the settings for you.
P.S. I don't suppose there's Metro firmware out there?
Click to expand...
Click to collapse
I don't think there's Metro firmware, because my updates still come from T-Mobile. T-Mobile owns Metro. So what you're saying is flash the firmware via Odin and my phone would be like truly unlocked and I would get updates from Samsung rather than T-Mobile? I don't want to go through all this if it isn't a a certain fix, but sadly there's no way to tell that.
For some carriers, the Wifi calling requires the phone to have carrier firmware. Verizon is one. I bought my 9+ from Samsung unlocked, and it didn't have wifi calling on Verizon until I reflashed the phone (using Patched ODIN) to a Verizon firmware and Wifi calling works... as does the Verizon bloat, but most of that can be disabled with Package Disabler pro or similar app.
creedicd said:
For some carriers, the Wifi calling requires the phone to have carrier firmware. Verizon is one. I bought my 9+ from Samsung unlocked, and it didn't have wifi calling on Verizon until I reflashed the phone (using Patched ODIN) to a Verizon firmware and Wifi calling works... as does the Verizon bloat, but most of that can be disabled with Package Disabler pro or similar app.
Click to expand...
Click to collapse
I don't think MetroPCS has it's own firmware for the s9+. Plus, they're owned by T-Mobile now. The plan I'm on is called MetroPCS by T-Mobile lol. This is driving me nuts.
C-4Nati said:
I don't think MetroPCS has it's own firmware for the s9+. Plus, they're owned by T-Mobile now. The plan I'm on is called MetroPCS by T-Mobile lol. This is driving me nuts.
Click to expand...
Click to collapse
Out of curiosity I read around a little bit and it seems to be really hit and miss, which definitely seems to match up with your experience. I did find this post on Reddit from someone saying they got Wi-Fi calling to work with a Metro Sim: https://www.reddit.com/r/tmobile/co...g_volte_not_working_with_metropcs_sim/cymnvhf
Have you come across that, tried any of that?
YrrchSebor said:
Out of curiosity I read around a little bit and it seems to be really hit and miss, which definitely seems to match up with your experience. I did find this post on Reddit from someone saying they got Wi-Fi calling to work with a Metro Sim: https://www.reddit.com/r/tmobile/co...g_volte_not_working_with_metropcs_sim/cymnvhf
Have you come across that, tried any of that?
Click to expand...
Click to collapse
I have not, thanks for the link, I shall try that. Funnily enough, there was a hotfix pushed out last night and WiFi calling not working was on that list. I now have the WiFi calling icon in the notification bar, and it shows like it's on, but it doesn't actually work, and me pressing it does nothing. The setting itself still isn't in connections or anywhere in the settings. This is so dumb, lol.

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