Hi, I've had my phone for a little while, and I've set up the Wi-fi with my home network. I think its connected, because in the wi-fi settings there's a tick by the network name, and initially I see the wifi signal in the top left hand corner. However, once I go to a webpage through safari, the wifi signal disappears and changes to 3G.....is this normal? Is there anyway to stop this from happening? I'm not very technologically minded, so any suggestions welcome!