Q: The phone is not working on our iPhone.  When you go to Setting -> Phone ... My Number is shown as Unknown.

Hey there JRB123JRB,

Thank you for using Apple Support Communities!

Take a look at this iPhone Troubleshooting Assistant name:

Calls and connection issues

http://www.apple.com/support/iphone/assistant/calls/

Start with step 2 and work your way down as needed. Here is step 2 to get you started:

Reset network settings

 

To reset your network settings, tap Settings > General > Reset, then scroll down and tap Reset Network Settings.

Cheers,

Sterling