So guys, my handset is not working in proper way. Its keyboard has got some problem and I have to press the keys very hard to right any text. So I have decided to replace my handset with a perfect handset. I am using AT&T cell phone with contract deals. I am looking for such handsets that can support the AT&T network. Guys, is it possible to replace my handset with an unlocked handset if the replacement phone is also from the same network service provider? Moreover, can I switch over pay as you go plan within the contract period? Guys, it is necessary to replace my handset, so please take it seriously and pass your experience. Thanks in advance.