I switched over from t-mobile to at&t last December just for the iphone. I pay around $100 (USD) a month for it and that price does not even include unlimited texting. So, I am considering jail breaking my iphone 3g to work with t-mobile but want to find out how much that will really save me. How much is your plan on t-mobile? I would already have to pay a $175 cancellation fee (I have over a year left on my contract) but it might be worth it if it saves me money every month.