We've just had this related discussion 
If, like me, you find having the number visible on your phone useful and its not showing up in the normal places - phone status, any 'my number' menu or the contacts list - its easy to make a manual copy.
My wifes J132 can manually set the 'My Number', check that first. Or add a contact, I'd suggest using the number to start the contact name to ensure it sorts to the list top and something that wont actually dial as the number.
