Straight talk sim card in Iphone 4 not working?

I purchased an unlocked iphone 4 from ebay. I took a sim card out of a deactivated nokia e5 and cut it down to fit the iphone. When i put the sim card in the iphone a notification changes from no sim card to no service. I tried to activate the sim card using the serial number on it via straight talk website. It keeps telling that the serial number isn't recognized. I don't know if I need a new sim card or what I need to do. Can someone please help me?!

This is how straight talk works. Once a sim card is deactivated, you can't reactivate the same sim card, you have to get a new one and activate it.

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