So I read some articles that people have swapped out their 3GS because of Wifi issues... I've noticed that I'm consistently getting 1 or 2 bars of Wifi access on any network, even in my tiny studio apartment where I used to get full bars on my old 3G. Has anyone successfully swapped their 3GS to get one that has consistent strong Wifi signals? Or is this a software issue with 3.0 and should I wait for the next software update? Any input appreciated.