In the about phone screen, does yours show own phone number? Mine says unknown.
Doesn't seem to be a big issue mostly but a quick google shows a workaround:
Go into Contacts -> [Menu] -> More -> Settings -> Own numbers -> [Menu] -> Create and type your phone number into the Number field, now Save. (don't enter a name into name field, just the number - it will save as "unknown")
Then switch your phone off and on again, and it should show the correct number (or whatever number you entered) in the status now.
Worked for me fine.