I bought a Nokia N800. I need a sim . There are two types of regular sims AT &T compatible or other. Whish one. Also it wont scroll. Someone said it is waiting for the new sim to unlock. True?
It doesn't take a SIM. It has no cellular connectivity. It runs a tablet version of Maemo.
In terms of SIM, there is not ATT & other. There are SIM sizes: mini/micro/nano and any carrier might be likely to run any size, be they ATT or T-Mobile or Vodaphone or whomever.
This device runs Windows Phone 7.5 (upgradeable to 7.8). It takes a micro-SIM which is the middle size. The radio is suited for AT&T or any AT&T airtime reseller.
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