Although I was not aware of it; it appears your 8120 has UMA.
Connection preference ONLY appears on blackberries with UMA.
UMA allows calls via wi-fi...hence why your able to call.
If you change the connection preference to mobile network, and keep the mobile network OFF and wi-fi ON; you'll still be able to surf the net, receive emails etc, but it shouldn't initiate UMA calling.
Can I ask which country T-mobile you are on? UK, US etc?
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~Midnight Draven
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."
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