With more than a decade of network administrator experience, Gregory has an information certificate from the University of Maryland and has MCSE certification. Scott says, however, that Virgin can unlock a new iPhone when a customer has previously quoted Virgin Mobile 14-day lock policy and wants us to honor it. Customers can call customer service at (888) 322-1122 to unlock the phones. Unlocked Cell Phones Under 50. If I have an international SIM card, insert it, activate the phone over Wi-Fi and then after activation, unplug the plug and reset T-Mobile, it will work with tmobile or still give the same mistake. So even if you just using GSM part as soon as you lose signal, the phone starts searching for cdma networks and it takes a little longer to connect to the GSM network sheep. Since iPhone uses 5 Nano SIMs, you must check if the operator offers Nano SIMs. If not, the SIM card must be cut to fit into the iPhone 5 SIM slot.