Sprint Upgrade eligiblity?

Eric

New member
I just signed a 2 year contract with sprint for a Sprint 4G Overdrive mobile broadband device. . I have heard about "upgrade eliglibility" on other carriers. My question is that am I eligible for a new mobile broadband card after two years? if the card is free, does that mean it is free for me after two years? What about cell phones?
 
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