Problems with Imessage since switching phone carrier
I recently switched from Verizon to T-Mobile, and got a new sim card for my phone (!0XR). Imessage is not working for some of my contacts since the switch. I've read articles online that say to check "Send and Recieve" in Settings-Messages, and also to turn off Imessage, restart my phone, and then turn on Imessage. I am unable to do either of these - in Send and Receive it says 2 email addresses with a > next to it, but I cannot open anything by pressing it. If I try to toggle Imessage button from on (green) to off - nothing happens! I am using IOS 16.3.1. Can anyone advise me on what to do next?
iPhone XR