A few times I have connected my phone to my wifi at home. Following that the phone will not connect to the network data. I'm no longer connected to any internet and my phone will not connect to facebook, twitter, online games... anything that needs the network. I've tried restarting it by pulling the battery, the battery and sim card, as well as, the battery sim card and memory card. I still have no connection. 
How do I fix this?!!
