db> * MNP Class 10 is neither compression nor error-detection.

db> M34F supports MNP Class 10 - does USR Courier?

DD> Nope, isn't it soemthing to do with cellular phones?

Not only.

DD> The Courier is about eight times the size of a cellular
DD> phone and probably not the first choice of such users.

Wot about the PCMCIA version ?  You might also care to explain
why USR DOES support some OTHER cellular phone oriented stuff too.
@EOT:

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