So, since no one has mentioned this, is it the case that an activated SIM card is not tied to the serial number (or EIEIO, whatever it is) of the device? So I can take the SIM card out of my 3G iPad and just swap it with my wife's, and both iPads will work just fine? Can my wife and I share a single SIM card and AT&T plan?
Forgive my ignorance.