Stop automaticaly switching to 3g if wi-fi drops I have an android 2.2 phone.  The other day, I was using a wi-fi connection on my phone and had it tethered to my laptop.  For whatever reason, the wi-fi connection dropped and my phone starting using my phones 3g connection to continue the internet connection tethered to my laptop...

Is it possible to stop this from happening? i.e. if the wireless connection drops, don't use the 3g connection automatically?
Turn off mobile data usage. Go to Settings->Wireless and networks->Mobile network(you should uncheck this). Some manufacturers may have a widget for this, such as HTC did for my Incredible(v1).