![](http://2.bp.blogspot.com/-iW5s4nTO1rU/Tpn3Wr2Vq7I/AAAAAAAAGGo/ucz21lLmOsQ/s1600/iPhone4.jpg)
Gevey SIM is an hardware unlock solution for the iPhone 4 with baseband 01.59.00, 02.10.04, 03.10.01, and 04.10.01 on iOS 4.x.x and iOS 5.0. A SIM interposer sits between the SIM card and the Modem to keep the device unlocked.
If you are on baseband 1.59.00 you may also consider using the Ultrasn0w software unlock.