Don't do it.
Seriously, clones are not worth bothering with, the iPhone and touch are expensive for a reason. If you can't afford, then save up, be patient - or get something else. A clone will just remind you that it's far from an iPhone, and you'll resent it, you'll be embarrassed by it, and you'll waste your money on it.
There are lots of chea phones out there with good features - It's better to have proper features than features added for the sake of it, ugly features usually, clunky, ugly, unresponsive features that make your nice new gadget so useful that it might as well be made from chocolate.