Can i use a $30 prepaid service card from straight talk on an iphone 4?

I bought a $30 prepaid service card instead of the $45 unlimited one. But i got online at straight talk.com and typed in the 'service pin' and it said something like 'it's not availible for this model' i don't remember and it not showing up anymore. So do you know why? Can i really not use the $30 card & if not them what do i do with it?

The $30 airtime card is for basic phones only. You can't return the card to Wal-Mart for your money back. The only thing you can do is purchase a $45 airtime card for your Iphone and give away or try to sell the $30 airtime card to someone else that uses the $30 airtime card for Straight Talk.

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