Ok, I've read a lot of mis/conflicting information about this - it seems like even Verizon employees do not know that the 4S has a CDMA antenna. So, my question is this: I have a factory unlocked iPhone 4S. It was bought for (and has been used with) an AT&T line. I have also tested it to work with a T-Mobile SIM. Will this phone work on Verizon or Sprint's network with their SIM card? Or is it somehow limited to GSM networks only? Any *correct* information would be greatly appreciated. Thank you!