Can i use my old iphone for the at&t straight talk plan?

I have an original iphone and it belonged to my boyfriend and i have it now because it has a lot of good memories of us stored it in, so i keep it for sentimental reasons. He had a family plan for it, but now the iphone has no sim card. I want to use the iphone as an actual phone but i do not have a lot of money. I looked at the straight talk plan and it is in my budget and i want to use the iphone for it. Does anyone know if i'm able to do that? Or what NON contract/ family plans i CAN use for my iphone?

I have never used straight talk, but i think that would be fine, if it has a SIM card slot. Do give their customer service a call then ask.

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