It is quite impressive to hear this but it is not wrong message. By using Gevey SIM, you can unlock iPhone 4 on iOS 4.3 with Baseband 04.10.01. However seem like the process is quite complicate and if you want to know the process, you can read further to get the information.
It is another part for unlocking iPhone 4 on iOS 4.3 to solve the problem and unlocking for those on iOS 4.2.1 with 2.10.04 or 3.10.01 baseband.
As the video above suggest, the unlocking iPhone 4 iOS 4.3 Baseband 04.10.01 is possible but I would like to suggest you to wait for official download software to deal with the problem.
If you want to get it fast, you can spend some buck ($50). Anyway you better learn more about how it works in a few quote below.
It is done by forcing activation the baseband using the emergency dialer.
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 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.
The result of SIM hacks has always been erratic since the outcome depends on the implementation of the hack as well as the policies of the network; and people were inundated with a long list of issues and makeshift solutions. e.g. Cellular data may and may not work depending on the chemistry; a common remedy is to periodically put the hacked SIM into an unlocked “nanny” phone to “keep the link healthy”.
The use of SIM hacks fell sharply after iOS 2.2.1 update where the new baseband were made aware of the method and reject dodgy IMSIs, even the better designed interposers suffered frequent failures. It is about the same time software unlocks were developed and it pushed SIM hacks further into disuse. However the technology has been kept alive since a number of GSM handsets, mainly those coming from Japan, remains vulnerable.
What does it mean to unlockers?
1. 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.
2. 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 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.
3. 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 purpose; the providers has no immediate incentive to fix the loophole.
4. 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 via NCK.
5. 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.
6. 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.