From an sudden supply, it is a manner gave the impression to unencumber the iPhone four on iOS four.zero or iOS four.2.1 the usage of a GEVEY Turbo SIM .
Which means that the baseband (latest firmwares) 10.02.04 and 03.10.01 will be unlocked from iOS four.1 and four.2.1 (which except now may no longer be unlocked ) with GEVEY Turbo SIM.
How did It Work?
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 MobileNetwork 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.
What does it mean to Unlockers?
It works if A.your network handles 112 calls properly according to the GSM standard; B.they are tolerant to TSMI spoofing and does not actively validate your SIM again for incoming calls.
Unlike its ancestors, the i4 SIM interposer is not a drop-in-and-forget device. The exact precedure must be performed should the device restart, lose reception for an extended period of time or move to another PLMN. In all these situations the TMSI expires and has to be obtained again. Theoretically it is possible for a daemon to automate the process similar to ZeroG, but that only makes thing more convoluted.
It is, without question, unethical or downright illegal to use the technique anywhere 112 is a legitmate emergency number. Not a huge issue in China where the number is only used for informative purposes and the networks cannot be bothered to fix the issue.
All firmware/baseband combinations for the i4 up to iOS4.3 are vulnerable, however the exploit may be patched in any future software updates or via the carrier. If apple can influence providers to block Cydia it is not impossible for them to press them to fix the exploit. The only way to permanently unlock your baseband is NCK.
SIM interposer should not harm your phone hardware, however your network could request IMEI and identify your device during the emergency call. Your identity cannot be faked and it is possible that they will ban your account.There is a reason why SIM cards remain legally the property of the service provider: you are not supposed to tamper with them without breaching contract.
Notwithstanding all the problems, SIM interposer does not cause any battery drain since it is only active transiently, nor would it cause signal loss because it does not change cellular transmission other than the initial validation step.
The GEVEY TurboSIM SIM functions as an interposer between the SIM card and the baseband hardware. The latest baseband of the iPhone because 4 can be activated by (among others) to connect to the emergency number 112. The baseband, after each reboot and / or loss of network connection should be reactivated. In China (where this unlock method originated), the number 112 only used to refer people to the actual emergency number. To take advantage of this method, you will unlock the allererst GEVEY TurboSIM should have. Additionally you will need some regular MicroSim narrowing gap all the EEPROM chip which GEVEY TurboSIM uses. The method could be rectified by a firmware update or carrier.
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