Hi Tom:
Do you mean that the caller ID display on the telephone plugged into the OBi says "out of area" AND it also shows the telephone number of the calling party (your cell phone in this case)? If so, then that's normal behavior. There are two separate components of caller ID: the number (CID) and the name (CNAM). CID is sent along with the call routing data from the called party's telco to yours, so it is easy to display. CNAM is not sent by the calling party's carrier. Instead, the called party's carrier has to look it up "on the fly" in commercial databases of numbers matched to names. Google does not subscribe to these fee-based services, so it doesn't display any CNAM information, just the number.
If that's not what you meant, then please clarify.