Dear All, I've recently purchased an iphone 4S black 32 GB. But unfortunately, when I put the MSN mobile's SIM card into the iphone, which is a billed SIM card, it does not work properly, because it works for dialing or receiving a call then it will start searching for an MSN network, (even if it does find the network) it will not call or receive any call. While when I've used a pre paid MSN mobile's SIM card, It works well. The main point is that I want to use my known SIM number that my friends know which is the billed number, nut the pre paid SIM number. Please if any one can help me, I'll appreciate if I receive the answer to my Email shown below. ALKEBSI@LIVE.COM Thank you very much for your kind concern and assistance. Regards, ALKEBSI