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Actually I work for Nokia Retail and it's something a customer has just asked - I said I'd find out for him, but no-one seems to know why it doesn't work, the best we can figure is that because it's a SE handset it wont sync with the Nokia Tablet.
DUN - Dial up networking, is a bluetooth profile, and it allows the phone to be used as a modem to some other device, eg laptop. In theory at least the N770 should be able to communicate via bluetooth to the K750i. I'm getting into slightly guessing teritory here, but some bells ring about the tablet sending *99# command, which opens up a packet connnection to the network. It maybe that there is some additional configuration needed in the phone.