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DUN=dial up network, for modem connections. Supported by most cellphones and a few access point type devices. PAN is personal area network, somebody's idea of how you can emulate a LAN (local area network, the common kind) over bluetooth - very rarely used. OBEX is object exchange, used for simple file transfers like sending contact info. There's also obexftp, which allows browsing a filesystem, but the current firmware doesn't seem to support that.
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