A colleague of mine had a Blackberry with Cingular which then transitioned to AT&T. They didn't have the capability to just assign a device a data plan without a phone number like he wanted.
I don't think you can actually have no number assigned. I've gotten "data only" SIMs for things like HSDPA dongles and alarm notification systems and they've all had numbers assigned to them. The number for the SIM inside my HSDPA dongle is in a weird mostly unused block but it works just like a regular number. You can send/receive calls and messages.
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