i bought a t-mo no-contract phone a while back and it came with a refill card and i have a few questions about the cards.

1) i am a contract customer and have no use for the refill card, is there any way to use this towards my contract account?

2) can i use it for anything else (i.e. like a pay per use data plan if such a thing exists)?

3) are there any other companies that will honor t-mobile refill card cash?

4) is there some place where one can check the balance of the card (i haven't used it but it is about a year old, should still be good right?)?

thanks!