kine pachi 3gs vanda 4g nai kine ramro hola... BTW price for unlocked iphone 4g is really high... 4g ma front camera vayeko le video chat garna ni milcha (facetime and yahoo). processor speed and and memory are also better in 4g.
3gs ma vayeko sab features 4g ma cha ani aru naya features ni cha..
I'd say go for 4g.