my iphone 4 has poor signal and constant dropouts in my room. i test side by side with other older iPhone 4(s), iPad and macs and my iPhone is the slowest and has the poorest signal. It keeps dropping out which leaves me using my 3G. i try to reconnect but my wifi doesn't show out until a couple of minutes later. it doesn't happen to any other iDevice i have! what should i do? should i get it checked out?