OK. I just finished
successfullyflashing the AT$T firmware on my unlocked Note 10+. I haven't flashed anything for at least a couple of years and that was on my S8+.
Here's was happened:
1. The Flashing process went easily and was uneventful. Success first time trying. So happy about this! After flashing (before anything else)
partially set up the phone
without doing any logins or putting the SIM card back into the N10+ I verified that the ATT Firmware was successful.
2. Immediately after inserting my AT$T SIM (from my old Note 9), a popup appeared and asked if I wanted to set up Wifi Calling. Setup worked perfectly!
3. I also saw the 4G LTE icon where before I saw LTE and when on a call "H" for HSPA+ service. YUCK!
4. Made a call to a friend and he said HD Voice was working. Wifi calling worked and call was crystal clear (not last night. Sounded muffled and the 1st call dropped. Remember, I do not have great AT$T service at my home).
5. While on the call with the friend, I turned off Wifi but the call itself was still using wifi calling. Once again I could not get a webpage to load or youtube to load. They just timed out trying. I couldn't get AT$T Visual Voicemail working either
6. I decided to reboot the N10+ and then used SmartSwitch to transfer info from my Note 9. After that process was done, Surprisingly Visual Voicemail worked (& even still had my personal greeting from the Note 9 setup). Also, I can now Surf the net with Wifi off when on a Phone Call!
I am thrilled that I do not have to return this Unlocked Note 10+! I really love the phone but if I can't
use it as a phone then it's worthless to me.
I am still supposed to be able to get the OTA (Over The Air) ATT software updates too. One thing that
could happen is when ATT updates their system and I lose Visual Voicemail or one of the other ATT-specific features. If that does happen, I might just have to re-flash the software. I'll deal with that if/when it happens.
Just to let you all know, I did a
ton of research on flashing by looking at the most recent Samsung Phone's (S10+, S9, Note 9, etc.) discussion threads on flashing. This XDA-Developers discussion was
super helpful & contained the AT$T firmware. I suggest that if you want to try flashing & have never done it, you must read every post. You should read every post anyway. Lots of questions/answers and great info there (this is the link I posted above too & many posts have been added):
https://forum.xda-developers.com/galaxy-note-10+/how-to/n975u-n975u1-firmware-links-t3957648
I'll wait a day or 2 before I pack up my Note 9 for trade-in return just to make sure...
Good Luck All!
It's things like this that make me hate AT&T. Being in Texas they are tops when it comes to coverage and capacity/spectrum and they are almost a necessary evil. I had an unlocked Note 9 and knew HD Voice/VOLTE and advanced messaging would not be available but I went ahead and bought the unlocked Note 10+ anyhow due to the $600 trade in for my Note 9. However after also using a S10+ the last few months for my work phone its been nice having HD Voice and advanced messaging/RCS. Strongly considering returning it and going with the AT&T version but I really don't want to give up my free Galaxy Buds I got with the promotional credit.