I like using my phone for texting mainly so I have a very cheap phone plan. I just discovered that all my time was eaten up by data usage. I thought I was connecting to my home router or other places I can get on for free. So is there a way to make sure my phone doesn't do anything that would rack up data charges? Will I still be able to connect to my home router for free? So in theory I'd like to be able to seach google when at home on my network but as soon as I leave I don't want it connecting to the mobile one and costing me.