the number, does it end in 111?
CDMA devices have a number pre-programmed into them in order for them to be able to be activated on the network by the carrier.
Most mobile phones pick up their correct number from the network usually after making the first phone call.
The 7250 doesn't seem to do this and may be an oversight by either the CDMA component makers, Qualcomm, or RIM to not allow this to happen.
Until a possible software upgrade is available to fix it, I suggest you go into the phone options and turn off show my number.
Phone => (wheel)Options => General Options =>
Scroll down, select Show My Number field and Change Option to No
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