There are, in essence, three different types of iPhone unlock methods: software, hardware and IMEI. The first two, software and hardware, unfortunately have their limitations and only include support for a limited number of basebands and firmwares. In fact, Ultrasn0w (the current software unlock) only includes support for iPhone 4 models with baseband 01.59.00, which means if you’ve updated your iPhone’s firmware since you purchased it, Ultrasn0w will not be capable of unlocking your phone. The only way around that is to have updated via Sn0wbreeze, which preserves the iPhone’s baseband.

Aside from a software unlock, hardware unlock methods (like Gevey SIM) are also limited and simply can’t support the latest basebands of newer iPhone models. The only permanent and “future-proof” type of unlock is through whitelisting an iPhone’s IMEI, which is completely safe and secure.

When an IMEI unlock is performed, essentially the iPhone’s IMEI is submitted to the original carrier’s whitelist database. The unlock process doesn’t affect the iPhone, in a physical sense, and doesn’t affect the phone’s factory warranty. Instead, once the IMEI has been processed through the carrier’s backend system, it should be permanently unlocked, regardless of the firmware and baseband (modem firmware). IMEI unlock solutions even function on every iPhone model, including the iPhone 5, iPhone 4S, iPhone 4 and the iPhone 3GS on iOS 6.1.3 or earlier.

point of correction, ALL UNLOCKING METHODS HAVE THEIR LIMITATIONS

1. ultrasnow
advantage-- works on all 3g and most 3GS (most newer models 3GS cant accept ipad baseband) and very old iphone 4 with bb 1.59

disadvantage--wont work on any iphone4 whose baseband is above 1.59. wont work on all 4S,i5. u must jailbreak to use ultrasnow

2. gevey,rsim,xsim,quicksim (ORIGINAL ooo. many fake in d market). AKA magic sim
advantage-- WORKS ON ALL iphone 4S and iphone 5 ios versions(including latest ios 6.1.3) and ALL basebands(as of today 27/04/2013) of
u DO NOT need to jailbreak to use them. price is btw 5-8k.
its like 20-30k cheaper than d unlocked one

disadvantage--You SHOULD NOT UPDATE TO A NEW IOS immediately (for example if ios 7 is released tomoro) . you need to wait for confirmation that the sim still works. if not the chip MIGHT NOT work on d new ios (it might also work, u just need to wait for confirmation). also it doesnt work on new iphone 4 or any iphone 4 on baseband above 4.10

3. IMEI unlock
advantage-- simply the best method (if u can afford it). no software,no chip, d fone imei will just be added to Apple unlocked imei database ( thru d carrier d fone was initially locked to) and d fone remains permanently unlocked forever.

disadvantage--- NOT ALL carriers support this method.
d price being charged by the supported carriers range from ( 2k to 45K). it now depends on how much u bought the locked fone.

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NOTED

where can i do d one of imei unlock?

Bro...pls can japanese locked iphones be unlocked in Nigeria? If yes....how much to unlock one?

tumababa: point of correction, ALL UNLOCKING METHODS HAVE THEIR LIMITATIONS

1. ultrasnow
advantage-- works on all 3g and most 3GS (most newer models 3GS cant accept ipad baseband) and very old iphone 4 with bb 1.59

disadvantage--wont work on any iphone4 whose baseband is above 1.59. wont work on all 4S,i5. u must jailbreak to use ultrasnow

2. gevey,rsim,xsim,quicksim (ORIGINAL ooo. many fake in d market). AKA magic sim
advantage-- WORKS ON ALL iphone 4S and iphone 5 ios versions(including latest ios 6.1.3) and ALL basebands(as of today 27/04/2013) of
u DO NOT need to jailbreak to use them. price is btw 5-8k.
its like 20-30k cheaper than d unlocked one

disadvantage--You SHOULD NOT UPDATE TO A NEW IOS immediately (for example if ios 7 is released tomoro) . you need to wait for confirmation that the sim still works. if not the chip MIGHT NOT work on d new ios (it might also work, u just need to wait for confirmation). also it doesnt work on new iphone 4 or any iphone 4 on baseband above 4.10

3. IMEI unlock
advantage-- simply the best method (if u can afford it). no software,no chip, d fone imei will just be added to Apple unlocked imei database ( thru d carrier d fone was initially locked to) and d fone remains permanently unlocked forever.

disadvantage--- NOT ALL carriers support this method.
d price being charged by the supported carriers range from ( 2k to 45K). it now depends on how much u bought the locked fone.

Nice . I have unlocked my iPhone by using Remote unlocking method . I got it from the provider Mobileunlocksolutions.com

helpful