Is there a "##72786#" code to use for other carriers, ie, AT&T, T-Mobile?

[Android Central Question]

I have unlocked Galaxy S9+/SM-G965U on Straighttalk/T-mobile sim. Mobile signal near 0 at home, switched just to use the wifi calling. All phone provisions/settings are there & on. Get mobile calls/sms/mms/internet (all very slow at home w/call drops). However, device still shows "IMS not registered"/wifi calling no worky. Been on the phone w/Straighttalk lots, even tried T-mobile, yah right. Can anyone help? Thank you.

 

[Chrislw01]

And also...

 

[mustang7757]

Ok this a Att branded phone , what sim you have in it now ?

 

[Chrislw01]

Straighttalk/Tmobile sim in now

 

[Chrislw01]

Picking up a Tmobile used sim at their store tomorrow, after which I'll try the wipe/reset, TMB flash again.

 

[mustang7757]

Re: Is there a "##72786#" code to use for other carriers, ie, AT&T, T-Mobile?

Picking up a Tmobile used sim at their store tomorrow, after which I'll try the wipe/reset, TMB flash again.

Ok try that sim first , then do a flash, i don't like the xaa twice in front of att

Should be like my screen shot
Tmb tmb xaa or yours tmb tmb att

 

[Chrislw01]

Yes... I wanna see TMB/TMB/ATT

 

[mustang7757]

Yes... I wanna see TMB/TMB/ATT

Exactly , so keep me posted , do the sim first

 

[Chrislw01]

Ok... update. (Didn't get the Tmobile sim till today.) So, it worked... kinda. After flashing/reboot with the tmobile sim in, I now get TMB/TMB/ATT, in about phone>software info>service provider sw ver. And, of course, all wifi calling settings are there, including a new quick settings button/icon for w/wifi calling, and I'm 99.99% sure it would work if I had tmobile service. I even got a prompt I've never seen during boot up asking if I knew my device could make wifi calls. However, when I restart again with Straighttalk sim in, the phone changes to TMB/XAA/ATT, the quick settings icon disappears, and of course, wifi calling no worky. Any way to prevent the Straighttalk sim from doing this? Otherwise, I guess I gotta get me some T-Mobile? Spent 30 min on the ph trying to be patient with Straighttalk, to no avail. But, in her defense, I don't she was very skilled yet.

 

[mustang7757]

Ok... update. (Didn't get the Tmobile sim till today.) So, it worked... kinda. After flashing/reboot with the tmobile sim in, I now get TMB/TMB/ATT, in about phone>software info>service provider sw ver. And, of course, all wifi calling settings are there, including a new quick settings button/icon for w/wifi calling, and I'm 99.99% sure it would work if I had tmobile service. I even got a prompt I've never seen during boot up asking if I knew my device could make wifi calls. However, when I restart again with Straighttalk sim in, the phone changes to TMB/XAA/ATT, the quick settings icon disappears, and of course, wifi calling no worky. Any way to prevent the Straighttalk sim from doing this? Otherwise, I guess I gotta get me some T-Mobile? Spent 30 min on the ph trying to be patient with Straighttalk, to no avail. But, in her defense, I don't she was very skilled yet.

That's great
No that's the way straight talk sim is , don't get the carrier provisions only use the towers .

 

[Chrislw01]

Update... So, flashing firmware with the T-Mobile sim in, by itself, was not enough to enable wifi calling. However, since I was now on TMB firmware, the phone began to download Android updates. After the 1st one, I shut it down & put the straighttalk sim back in just to have sevice. But the android updates kept coming. At first, I paused them because I thought I was still gonna have to wrestle with it. Then I figured, what th hey, let it update, just can't go backwards with bootloader version if I need to do any more flashing. At this point, I tried a trick I found, not entering my pin at boot, and forcing another reboot (or something). Anyway, when it got to the 1st version of Pie, & finished booting, there they all were, the wifi calling settings, the quick button, IMS registration, all there & working on straighttalk. I'm still gonna make the switch to Tmobile. No contract $25 connect w/5gig is a deal & $10 cheaper than straighttalk!

 

[mustang7757]

Update... So, flashing firmware with the T-Mobile sim in, by itself, was not enough to enable wifi calling. However, since I was now on TMB firmware, the phone began to download Android updates. After the 1st one, I shut it down & put the straighttalk sim back in just to have sevice. But the android updates kept coming. At first, I paused them because I thought I was still gonna have to wrestle with it. Then I figured, what th hey, let it update, just can't go backwards with bootloader version if I need to do any more flashing. At this point, I tried a trick I found, not entering my pin at boot, and forcing another reboot (or something). Anyway, when it got to the 1st version of Pie, & finished booting, there they all were, the wifi calling settings, the quick button, IMS registration, all there & working on straighttalk. I'm still gonna make the switch to Tmobile. No contract $25 connect w/5gig is a deal & $10 cheaper than straighttalk!

Thats great