Just go for iphone. Right now i buy iphone 4 32gb. About a month. Before this i'm using samsung galaxy s plus, to much lagging. I'm decided to change to iphone because I got iPad 2 16gb wifi. Better go for 32gb and above. Like me student, no money to buy apps. So just jailbreak. It's legal now. But avoid warranty.

[quote=perrrhhh,Dec 30 2012, 12:15 PM]
So u mean 16gb iphone 4s are lagging?

Not lagging but not enough space. Becoz many apps are big size. And the pics size, video all in big size mb. If u buy 16gb, u cant add external storage

If u plan to use the iphone for 3years+ go for 32gb. If u plan for -2years go for 16gb later u can sell and buy iphone 7. Haha