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There are really three catergories:
High Speed
Wifi (802.11a/b/g)
Traditional wired LAN (Ethernet 10/100)
Med-Low Speed
GPRS/1xRTT (int with cellphone via bluetooth, serial cable or IrDA)
Low Speed
Modem - dial up.
I don't know anything about Nextel, sorry. But it's likely one GPRS.
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