Gevey Sim Can Unlock Iphone 4 – All Basebands

Update : Gevey Sim is now available for sale on Amazon. Buy your Gevey Sim Unlock Now .

SIM Based Iphone 4 Carrier Unlock seen in the wild [ video below ]. Gevey Turbo Sim claims to Unlock iPhone 4 4.1 – 4.2.1 baseband 02.10.01 – 03.10.01- 04.10.01 (also) with a Micro SIM Card based exploit . China based Gevey Jailbreak Team have published videos of unlocked iphone 4 with specialized micro sim cards which they call “Turbo Sim” [image below].

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Update : Here are some working videos of Gevey Turbo Sim by users who ordered and received their Sim Interposer Package . Check out links below.

What is Gevey Sim ?

Gevey Turbo Sim as they call it is actually not a simĀ  . It is a sim interposer . An interposer is an electrical interface that directs the connection from one socket to another. The purpose of a sim interposer in this case is to re-route a connection to a different connection which can then unlock the iphone 4 . Gevey Sim Interposer is an integrated circuitĀ  which contains the unlock exploit using emergency number dialing [112]. The diagram below can explain the integration in a better way .

gevey sim and micro sim

Useful : Ask Your Gevey Sim Questions here .

According to their blog updates , you don’t require to get a software unlock [using Ultrasnow 1.3] or jailbreak your phone . Turbo Sim works without breaking your precious warranty . Just insert your Gevey Turbo Sim and it can unlock your iphone 4 in minutes . After the unlock you can use the sim card of your choice from any carrier .

MuscleNerd about Gevey Turbo SIM :

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Gevey Turbo Sim Unlocking Video on YouTube :

The Unlock Video below shows two carrier locked iPhone 4’s running firmware iOS 4.1 and iOS 4.2.1 . The guy inserts the Gevey Micro-Sim Card on both devices which then shows invalid sim card inserted . Within few minutes both the phone are unlocked and show network bars . The unlocked phone were then able to make phone calls and access internet .

How it Works ?

SIM card holds many different types of information, but the part most involved with carrier lock is the IMSI number, which is a unique code that corresponds to your account in the mobile carrier’s database.

A sample IMSI might look like this

310 150 987654321

The first two segments are known as Mobile Country Code (MCC) and Mobile Network Code (MNC) respectively, and in the example above the IMSI indicate the SIM is from USA (310) AT&T (150).

When the iPhone baseband is loaded into memory, it checks the MCC and MNC against its own network lock state stored in the seczone. If the combination is allowed, the cell radio is activated and vice versa.

The earliest iPhone baseband revisions only check IMSI twice following a restart, therefore it is very easy to send spoof information in order to bypass the check. Nevertheless, the baseband was soon updated to validate SIM more aggressively and the method soon became obsolete.

Update : The release date of Gevey Turbo Sim has been announced . According to the tweet from the official twitter channel of Gevey Sim Developers – Sellers , the Sim will be available for sale after March 18th or 21st. Make sure you are Subscribed to our blog to get the latest updates about Gevey Jailbreak Free Unlock Sim .

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