I tried in vain last week to get some free wifi while walking around the city. I connected to a few networks but then couldn't get anywhere when trying to browse. No big deal. But now the phone keeps swithcing to wifi when I pass all these buildings and it's just annoying. I doubt there's much of a negative to it happening but I'd just like to wipe the phone's memory of all these networks, or even all networks totally and just set it up for my home network again. Does anyone know how?