Hi all, I am planning to get an AT&T cell phone from ebay and for some reasons I don’t know what it is said its an unlocked AT&T phone. Though its from a legit seller but what does “unlocked” mean? Will I be able to use all services fine or will it create any problem for me. Will I be able to insert sim without any problem as I have never heard about unlocked AT&T cell phones as I have only heard about unlocking a phone. So, friends kindly share your views on it and let me know what does it mean.