The service is for full unlock iPhone fromVietnam Viettel by IMEI. This service will help you to unlock iPhone 2G, 3G, 3GS, 4, 4S, 5, 5C, 5S, 6, 6+, 6S, 6S+. Unlock iPhone is done only once. After unlocking the phone will have assigned a status of SIM-FREE NEVERLOCK. The smartphone can be used with any operator.