Hello, I have a blackberry curve 8520 with NO data plan on T-mobile. I want to use my home network to check my email on the phone instead of turning on the pc. How can I make sure that I am using my network to browse the web and not the T-Mobile network??? I do not want to get a huge bill for browsing. Also, when I take out the SIM card and browse the web is there anyway I can be charged for it or is it completely free?? Thank you.