Did you pop up the menu and view all options?
The phone number field doesn't show up until after you bring up the pop up menu with the scroll wheel. Then you will seen a menu option "Edit SIM Phone Number"
Once you fill that out. The phone number field shows up with the data you will have just provided.
"If tyranny and oppression come to this land, it will be in the guise of fighting a foreign enemy. No Nation could preserve it's freedom in the midst of continual warfare." -- James Madison.