DUN = Dial Up Networking.
This means, if you have a laptop, connected to your EVDO enabled phone, you can use it as your wireless modem so you can browse internet at EV-DO speed ~ several hundred Kbps.
Using your minutes, of course, but without having to sign up for a separate data service plan at additional fee.
I haven't tried this myself. Let me know if anybody has success with it.
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