Hi, I am on an iPhone 13. Recently I have stopped receiving SMS messages and MMS messages. This is becoming quite a problem as I can’t get verification codes. I have chatted with tech-support on multiple times, and I’ve done everything from resetting my network settings to rebooting my phone multiple times, the last communication I got gave me information for what to do with an android phone. So even after all of this, somebody still doesn’t know what type of phone I’m using I need to get this resolved and I’m hoping somebody has an idea of what I could do to start receiving SMS messages again.
Long story, try this:
1. check for iOS updates
2. Backup to iCloud
3. You will lose non-default settings and WiFi passwords, write down anything important first
4. Settings>General>Reset>Reset all settings -- Reset network setting does not work
Wait a while it will take about 10 minutes
This worked for me.