Received my device today and took the sim card from my iPhone and put it into the new phone. I got no service bars etc. I called At&t and they then activated the card that came with the phone, told me to put the new card into the phone and reset it. I do this and then neither card is getting service. I go by At&t and they check it out and even try putting a new sim card into the phone to no avail. Device doesn't have "No sim" message so the phone does know the card is there but I am not able to make calls, use data ,etc. At&t rep tells me to go to "Ubreakifix" because they have Samsung cares. I go there and they do a reset and change the motherboard and still no luck. Looks like its not meant to happen. Anyone else have these issues?? They told me to contact Samsung. MAJOR BUMMER!!