I've been using BT DUN for internet since the 6.x, up to now it is still always trial and error to make it work, I don't see too much info. on BT DUN all I can do is to messing up with 2 files namely hcid.conf and rfcomm.conf, in short, if I can successfully pairing my phone then it will work, but most of the time I fail for unknown reason my phone just say 'unable to pair' without further explanation. I am using a Nokia which is the most common cell phone on earth, it has a very reliable radio and when successfully paired with my PC, it can stay on overnight for hundred megabytes download, you may think I am crazy but this is the way I work internet here with a low cost plan, and I am sending this via my GPRS link I just successfully made it work, but don't know when it will suddenly drop and the pairing gone again, this is not my first phone to try, I got similar problem with Motorola so I guess there is something to do with Kubuntu.
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