I've been using my iPad 2 for about seven months, with no real problem. The other day, I closed the case and came back a few hours later and suddenly had no internet 3G access. My ATT account is current. After a few checks, in settings I noticed the cell line was pale and had the words "no SIM" next to it. I couldn't click on it. THe iPad didn't fall or get banged. It just says no SIM. The wifi is working fine but not the 3G. I restarted it to no avail a couple of times. So, I have to admit I don't even know what a SIM is or why I suddenly don't have it but I sure miss the 3G aspect of my iPad. Can anyone help"? thanks in advance for any thoughts.