mobile phone as bluetooth dongle?

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http://crunchbang.org – hello,i'm trying to use a spare mobile phone (nokia) to connect to mobile broadband internet.i tried with bluetooth-applet first but didn't succeed.then i installed blueman. i can connect the phone but then it says that the network manager doesn't recognize the device (these are not the precise words).before i start randomly installing new software i thought i'd rather ask first.the search on this forum didn't give me satisfying results.thanks in advance!d. (HowTos)