Usually i can connect to wifi no problem, but all of a sudden my phone has stopped connecting. I have turned off wifi and then turned it back on again and it says it's connecting, but then changes to 'disconnected' even though it should be on. I've tried turning my phone off and on, i've taken the battery out, i've put it on airplane mode but nothing is working! It's happend once before, and i ended up turning off wifi altogether and having to use internet through 3g for a week until it miraculously decided to work again!

Does anyone know how to get it working again please??

I have this problem, but never with my own home based wifi. Sometimes I can't connect to a publicly available wifi though. I always attributed it to a weak signal or problems with the configuration.