I have a laptop and a friend gave me two old AirCard's that he is not using anymore. One is a Sierra Wireless Aircard 775 (EDGE-GPRS-GSM). The other is a Sierra Wireless Aircard 580 (Sprint PCS Connection Card).
I have two questions:
#1. What is the difference between the two cards?
#2. How do I go about getting service provided to me through these cards (who do I contact, how much can I expect to spend, etc.)