Verizon keeps sending me notifications after switching to AT&T!

Problem was resolved, and it was pretty simple.  Every time the message came up, I had cancelled out of it for fear that proceeding might screw up my connectivity through AT&T.  So I did a back up of the phone, and next time the message came up, I hit continue, and allowed it to create a new cellular plan under Cellular Settings.  I then was able to delete that cellular plan, and have had no problems since.  One might say, well duh...  but remember that I was on the phone with tech support at Verizon, AT&T, and Apple, and no one suggested I do this.  Sandblaster suggested that this problem could indeed be due to some partial entity within the phone, and I think this was correct (so thanks again).  Hope this is helpful for someone else down the road. 

contact verizon

I contacted Verizon customer care, technical support, porting department, and Win-Back department, and so far the harassment hasn’t stopped.  That’s why I posted here, to see if anyone has ever heard of this problem, and how it got resolved.

Apple helped me ensure my eSIM (where Verizon plan resided) was wiped clean.

My guess is that esim did not get wiped clean. 

Thanks, but Apple walked me through clearing the eSIM.  The problem stops if cellular connection is turned off, but resumes when it is turned back on.  So it looks like something they are sending out rather than something which is lurking in the phone.  AT&T should be annoyed that Verizon is harassing one of their customers in this manner.

So it looks like something they are sending out

Yes, something they send out because something on the phone is attempting to connect to Verizon’s network which require a sim. Apple may have walked you through the process but sure sounds like the esim is still there. Perhaps you’ll need to set the phone to factory settings and restore from a backup. 

Hi Bob_in_NJ, we do understand how frustrating it can be to continue to receive notifications from your previous carrier.

Try resetting your network settings to refresh your connection to the AT&T network.

Settings app > scroll to and select General > scroll to and select Reset > select Reset Network Settings > select Reset Network Settings again to confirm.

If you continue get the notifications, continue to reach out to Verizon on how to stop them.

Let us know if this helps, and thank you for contacting the AT&T Community Forums.

Jeff, AT&T Community Specialist   

Thanks for the feedback Sandblaster and Jeff.  Already tried resetting the network settings, no success.  Agree that I may have to try factory reset.  Will update the thread if it gets resolved.  Otherwise, any other ideas are appreciated!