i need an iphone 4 under priced upto 20k.. locked or unlocked doesn't matter..
See mate , locked fone r gud till having baseband till 4.10.1 (iPhone 4) with iOS till 4.3.5 or preserving the baseband and upgrading to 5.0 0r 5.0.1.
The above baseband can be Unlocked by Gevey Sim.
I wud advise to go Unlocked version , might it will cost more but it will ease to use.
Some Carrirers can be unlocked but some of them like AT&T & few hours cannot be unlocked, that time you will in big trouble