Apple via Yahoo! Finance:
Duplicate MEID codes were flashed onto an extremely small number of iPad units for the Verizon 3G network,” an Apple spokeswoman said but declined to say how many units were impacted by the issue.
MEID stands for Mobile Equipment ID and each Verizon iPad 2 needs to have an unique number. You know what to do if you own a Verizon iPad 2 and have been receiving unrequested data.