I am using it on reliance.See thishttp://www.techenclave.com/show-off/half-rotten-apple-and-more-198153.html
@OP $400 is a very high price for iphone 4 CDMA.You can easily get a new bad esn one for $300-320.
What is the budget ?
There are many option to get from US
1.Samsung Galaxy S
2.HTC EVO 4G
3.HTC Incredible II
4.Samsung Fascinate.
I have used Samsung galaxy S,HTC Incredible before switching to Iphone 4 CDMA.
Buy a nikon D90 with Kit lens 18-105 or tamron 17-50mm.
If you want to do macro photography use Extension tube with any of the lens stated above.
Let me google that for you