GEVEY™ Turbo SIM is a hardware device that unlocks your iPhone without software programming. Buy genuine GEVEY™ products from the most trusted brand in the industry. No need to dial the emergency number 112 during installation or when rebooting your iPhone 4S.I Untethered Unlock No configuration needed for GEVEY Ultra S No need to connect your device to a computer or jailbreak to unlock. Just plug and play! Less Power Consumption GEVEY Ultra S uses less batter power Built on an advanced chip set engineered to operate under the 3-volt standard to save battery power. Better Reception GEVEY Ultra S gets better reception Engineered for enhanced signal strength with strong, consistent voice and data connection. Works on all iPhone 4S SIM GEVEY Ultra S works on nearly all GSM networks A single turbo SIM automatically "learns" your network to work with all iPhone 4S SIM cards.