i bought an iphone 4s a few days ago, and i think its so excellent with many functions, but something makes me afflictive is that the screen is too much big, every time i take the phone, my hands feel tired after a short time, what's worse, each time when I?m in the bus, I find it trouble to answer the phone! so i wanna to buy a cheap Bluetooth Headphone, but i don't know where to find that very thing... is anybody any suggestion? thank you very much...