said by kapil 
:There is no "modem" per se...just an adapter, like a bluetooth or 802.11 adapter.
Sprint has already committed to making the network "portable" and "open"...and I believe them....they're not as maniacal about control as, say, Verizon. Look at the Blackberry 8830 offered by Sprint PCS and Verizon Wireless.... VZW locks down the GSM portion, Sprint leaves it unlocked...different corporate philosophies.
FWIW, DSL and Cable "modems" could also be made smaller and portable, but why bother since the service, naturally, is tied to a wire.
Well, of course, there is a modem per se (as in MODulate and DEModulate), I am speaking technically as an engineer. I am not referring to the physical implementation.
