If you want to unlock your iPhone 4, try Gevey. This is what worked for me eventually. It is an ingenious hack where you hardware patch your SIM card.
The nice part of it is you don’t touch the s/w so it doesn’t void your warranty and doesn’t anger CuperGods.
he bad part of it is each time you reboot the phone, you have to do a 20 second song and dance to make it work. (See the instructional video). It is a minor irritant, but the upside is great.
My wife is using it on Airtel 3G in India and it works just fine.
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