I found this link on the Symantec website for the VISA prepaid credit cards that they send as rebates, and I tried it on my Sprint rewards VISA card and it works.
The link is for the Symantec Visa, but it works with my Sprint card. The banner at the top will change to Sprint once you enter your info.
I thought this was a good site to post because it doesn't require to set up a username/password. Of course you could just go to the http://www.myecount.com/sprint and set up a username/password to see the balance on your card.
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