WIFI Calling Preferences Being Forced to Cellular Preferred

@fireguy_6364, I do not have a FB or Twitter account to deal with them. I have also tried calling and support was pretty useless. I had to troubleshoot through the internet to figure out to turn 5G off.

I find it very interesting that TMobile has not responded to this. I had the same issue with my Samsung A71. I specifically moved to TMobile for the 5G capability which is not worth the letters that make it up. Why be sold into a 5G capable phone (for obvious money) when the service is not consistent. I too disabled 5G and have so far had limited success with the results. It still toggles back and forth but instead of every 10 min, I am down to about 5 times a day...success?!?! maybe. BTW, 5G was 50% speed of my old Samsung S10 on 4G on other carrier.

I have the exact same problem on my samsung s10e android software version 10.  The problem started very recently immediately after an update.  For over a year the phone was working fine.  Now I set my preferred network to Wifi (because there is very poor tmobile coverage at my house) I have excellent wifi signal.  After a few minutes my phone alerts me that it has updated my preference to Cellular.  There is thread from over a year ago reporting the same problem but the thread is marked solved and I don’t know why.  A lot of people started posting on it recently saying they started having the same problem in the last two months.  Does Tmobile think the problem is fixed because it most certainly is not.  

Went to the T-Mobile store on 10/20/20 to get the two “new” phones I was promised.  Only one phone was there and it was a refurb despite my specifically being told it wouldn’t be.  I passed on the refurb.

The district T-Mobile manager was there that day.  He called T-Mobile from the back room where I couldn’t hear and came back with a proposed solution:  disable 5G.   I put my phones back to LTE, disabling 5G.   The WIFI Preferences optimization notifications continued incessantly as before.  Actually I noticed that that the phone was actually bouncing between WIFI Preferred and Cellular Preferred settings, as others have described.   I had been setting it to WIFI Preferred and observing it being flipped to Cellular Preferred.   I did not realize that it would also optimize to WIFI Preferred, although much less often than to Cellular Preferred.

Interestingly, a new software update installed to my phone early in the morning on 10/21/20, which was the second update I received during the month of October.   For the rest of the day my phone continued changing the WIFI Calling Preferences just as it had before and making frequent notifications.   But by the next morning, the behavior abruptly stopped and both of my phones now seem to be working normally for the last six days, despite WIFI Calling being left set to Cellular Preferred and my being in a very weak signal area.   Hmmm.  

So everything seems good now for both phones.   Hopefully, I’m not celebrating too soon.   I might eventually reenable 5G and see what happens.

I’m guessing there may be some kind of learning going on where the phone now might be figuring out where I spend most of my time and connect to WIFI.   I wish there were a technical explanation somewhere about what really goes on “under the hood” with WIFI Calling, what the issues have been, and what fixes or other changes have been implemented over time.

I will post back if problems reoccur.