Who I have the same questioned this topic

On my IPhone 11, I am no longer getting verification texts since my switch from T Mobile to Verizon. Not even the phone call verification comes in. Since my switch, I have had to re verify my accounts which my number is connected too but I have been unable to do so because of this issue.

I have tried everything from confirming that send and receive is my number instead of email and that mms messaging and group messaging is on. Even logged out and then in on my iPhone. None of these setting were changed to what it was before.

please advise how I can fix this issue 

thanks