That part I don’t understand either why it does that, but it did the same thing to me. I could make calls receive calls, but I couldn’t use iMessages and it did the same thing when I went into the settings. It did not show the phone number you could try resetting your network settings by going to settings on your iPhone General scroll all the way to the bottom where it says transfer or reset, and then hit reset, and then select network settings only it’s always worth a shot that might solve your issue. Just remember that resets all your Wi-Fi network connections as well so you’ll have to re-enter your password for your Wi-Fi. It does Not erase everything on your phone.
