Over time, all is forgotten, and many no longer remember (and some not at home at all) times when unlocking the iPhone 3G, iPhone 3Gs made no soft unlock, but with Turbo SIM. With release iPhone 4 Gevey developers decided to recall the "long-forgotten old" and have developed a new adapter level itc Gevey Turbo Sim. This is due to the fact that the guys from the Dev team simply can not be fast enough to produce software unlock iPhone 4 with the newer firmware.
What represents a unlock with Gevey Sim? This is nothing but an adapter into which is inserted SIM card (Gevey adapter with your SIM card is inserted into the phone). When you work with the iPhone 4 Gevey Sim, phone receives a signal from card I think that it is my own SIM card (ie, it is possible to use the phone with absolutely any mobile operator).
Gevey Sim works with the following firmware versions iPhone: 4.0, 4.1, 4.2.1, 4.3, 4.3.1, 4.3.2, 4.3.3 Supported Gevey Sim version of modems iPhone: 1.59, 2.10, 3.10.1, 4.10, 4.10.1
Together with Gevey Sim Included you will find the SIM card holder, which differs from the standard. It's Main features associated with construction, part of which is the EEPROM chip, which is not installed in a standard holder micro SIM for iPhone 4.
Also worth noting is that when you reboot or turn off the phone, these actions need to be repeated!
To date, the decision to quickly unlock iPhone 4, using Gevey SIM is the best and most affordable.
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IMEI-Server.com: codes to unlocking mobile phones by SimLock
