I guess there are still people out there that don't have a clue what they are talking about but yet still answer questions. Yes the AT&T SIM will work in the Storm but you have to get it unlocked first. For those with inquiring minds the device is a world phone and even though it is made for Verizon, which we all know is CDMA, this device also has a slot for a SIM card. This is a dual network device.