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I had the iPhone 4 and really likes it but the 4s is an even better phone. Everything seems to work better. The camera is great and the phone over all is noticably faster. I have much better reception and call quality but I that has more to do with my switch to Verizon. Siri IMHO is worth the upgrade by itself. Very, very useful feature for me. I use her more and more everyday. Do It!
I had the iPhone 4 and really likes it but the 4s is an even better phone. Everything seems to work better. The camera is great and the phone over all is noticably faster. I have much better reception and call quality but I that has more to do with my switch to Verizon. Siri IMHO is worth the upgrade by itself. Very, very useful feature for me. I use her more and more everyday. Do It!