MMS problems after Android 8.0 Oreo update? (T-Mobile US) - Sony Xperia XZs Questions & Answers

I have the international G8232 version unlocked on T-Mobile in the U.S. I just got the Oreo update a few days ago and ever since then, I haven't been able to send/receive MMS unless I have my mobile data on. Previously, it didn't matter whether it was on/off and I was able to do it just fine. I use Textra and I've tried messing with different APN settings but none of them work. Any ideas?
Should I try flashing to the G8231 U.S. version so that I could also get T-Mobile Wi-Fi Calling?

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Data on AT&T with Verizon (2.05.00WU)?

I security unlocked and flashed the patched radio, but now I can't use data. I tried changing the connection settings (I added a MEdiaNet connection in My ISP). I only need it to use MMS, but this is getting frustrating; what am I missing?
Im in the same boat with you BT, unlocked vzw tp2 to use on at&t. sms and voice work without any hassles. but medianet is being the biggest pain. i fussed with the settings for two days and finally got everything working flawlessly. then i restarted and apparently verizon programmed it so that it always writes vzw's wireless settings back. im guessing i have to try a rom in order to stop that. ill let you know if i have any luck.

[Q] Fido MMS issue after Android 4.3 update

Hi. I recently updated to Android 4.3 version. As a result, my MMS no longer works unless my data is enabled. Before I was able to send/receive MMS without having to turn on my data. I want to be able to do this again. I have tried many different APN settings but to no avail. I am with Fido (Canada) by the way, and everything else works including LTE. My phone is an unlocked Xperia T. If anyone can help me out, I would really appreciate it. Thank you.

Unlocked SM-J237P can't send/receive MMS

I purchased this J3 Emerge from Sprint and later carrier unlocked it and ported to T-Mobile. The phone can make and receive calls and data works but MMS fails both for media and for group texts. I have updated the APN based on T-mobiles recommendations but no luck. The T-Mobile tech support guy (who actually seemed very knowledgeable) said that some unlocked sprint phones basically get locked to using Sprint's servers to download and upload MMS. I asked him if rooting the phone would allow better access to this and he was unsure, so that is my question:
Is there a custom ROM or root app that will fix this phone's ability to send and receive MMS?
Thanks in advance!

Tmobile volte and wifi calling

Hi, I was hoping someone can help me activating the volte and wifi calling for Samsung A8 2018 (SM-A530f/DS). I got this phone in the Philippines from Smart carrier. I had a 3rd party unlock and been using it USA for almost 3 years with some issues (most of the time cannot get 3g calls/text when connected to wifi). Tmobile Announced next year 3g is going away and require volte 4g for calls.
I have updated firmware to current stock rom from original carrier, android 9 pie nov 2020 security patches. I can see wifi calling and volte toggle in shortcut settings, but it wont activate (probably since its not available in actual settings). Been researching old threads on how to enable it but no luck. I have rooted the phone and tried to copy over of CSC files from here and youtube but no success.

HTC U11, Dual Sim, unlocked, Mobile data is not working in T-Mobile, ATT networks.

Hi.
I have HTC U11, Dual Sim, the International version that I bought from China.
After that, I have changed the CID for it on the Taiwan version.
Currently, it is:
HTC_U-3u
Android 9
Software number 3.22.709.2
Rooted, not custom rom.
I have been used it with several MVNOs (Mint, Hello mobile) that are working on T-Mobile network for the last 1.5 years. Currently, I use Hello mobile.
All worked fine (4g, voice, text, data) until last week.
From the last week, Mobile data is not working anymore. It always shows as "Disabled" when I try to enable it, and no icon in the status bar. Meanwhile, voice and text are working fine.
I didn't do any system updates or new soft installation on my phone.
I tried to reset network data, reboot, checked with support (no issues with my number), checked APN with t-mobile recommended, changed mode on 3g, 2g, and without success, mobile data is not working.
I tried to put my sim card in another phone that I bought here in the US and the mobile data is working fine there, I see the LTE icon, and so on.
Also, I checked my phone with a sim card from ATT, and the same issue, voice, and text are ok and no mobile data.
The Signal Spy app shows me that the phone connected to Band 4 (1700). I checked T-Mobile and ATT websites and see that this Band in the list of supported 4g bands.
Also, I checked the compatibility by IMEI on websites and it showed me that only WiFI-Calling and VolTa will not work on my phone, but common 4g data is supported.
So seems all should be work fine but it is not. I found some posts on Reddit that T-Mobile wanted to change some Bands from 4g to 5g, but I don't know if it is the root of my issue.
Does anyone have this issue with this phone in the US on T-Mobile?
I don't know what it was but today Mobile Data started to work, the whole past week I had no mobile data connection.

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