Received Christmas gift IPAD 2.....When home IPAD worked ok...Worked fine from 12-25-11 until Jan 1, 2012. AT&T wireless phone is service. I live in the Sierras (CA) but my cell works fine. The IPAD worked until New Years Day...then "No Service" in left hand corner; tried several "hot spots" (and even better reception for cell phone)around the area, IPOD did "Searching" but, nothing. "No Service". Then starting getting pop-up window: "Could not activate cellular data network". I contacted the "gifter" and he contacted AT&T and they confirmed that my IPAD 2 was "in service" and should be working. I have not changed any settings, etc. I see by browser searching (my "other" computer) that this may be a common problem. Anybody got any answers?