Unlock iPhone 4 using Gevey SIM is illegal

Unlock iPhone 4 baseband 04.10.01, baseband 03.10.01, and baseband 02.10.04 using Gevey SIM recently becoming very popular amongs iPhone users since there is no unlock method yet from iPhone Dev-Team, Geohot, or any other known iPhone unlockers.

It costs $70 for a gevey sim-card.

But,

dial 112 then hang up in illegal thing in the U.S.

and could be illegal in other countries as well.

That “dial 112 then hang up” thing in gevey sim method is illegal in USA, and probably other countries.

Okay, if you may wanted to read how it works, this is the boring part about 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. [..]

[..] Apparently somebody figured out that while the i4 baseband has been patched to prevent test IMSI from working, it is still possible to force activate the baseband using the emergency dialer.

It works if A.your network handles 112 calls properly according to the GSM standard; B.they are lax on TMSI management and does not actively validate your IMSI 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.

MuscleNerd the member of iPhone Dev-Team has warned via Twitter about gevey legalities. He tweeted that ‘dial 112 then hang up’ in gevey method in order to unlock the iphone 4 is illegal in United States, and may also illegal in other contries.

That “dial 112 then hang up” in gevey https://is.gd/FGNeJi is illegal in USA, and probably other countries. Buyer beware.