Phone as Modem

I have a Razr V3, and an imac with built in bluetooth. I downloaded a script that allows me to use my phone, over bluetooth, as a modem to connect to the internet.
How much does this cost, if any? I dont get any warning or message stating that im not allowed to do this, i just click "connect" and it says "connecting" then that im online. the internet isnt very fast, only around 28kbs, but it works. it gives me an IP address, and that i have "unlimited" time remaining. Am i going to get a bill saying i owe tons of money to t-Mobile for this?

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Uhm..Yeah. I'd call T-Mobile and see. If need be have them backdate their T-Mobile Total Internet to the beginning of the billing cycle. I don't know if it will charge you without the feature but I imagine that it will. Just call customer care. It's better to be safe than sorry!

Very easy to do this

modemguru.bolgsopt.in

very easy to use mobile phone as a modem
How read at

modemguru.blogspot.in