I upgraded to the 4S merely because I needed an unlocked phone and it was only costing me about $200 since I sold my old phone. Anyways I was under the impression that reception was supposed to be enhanced in this phone... I work in an office that has moderate signal strength and zero signal when I'm in certain parts of the hospital. I've noticed a lot of times when I go through zero signal zones and then go outside (where I normally have maximum signal when I am coming TO work) I don't get anything. Just says "no service" not even "searching". The only way I get signal is to toggle airplane mode and then bam, I get full strength + 3G. This has happened a number of times and in other locations other than where I work. Ideas?