best/cheaptest way to make international calls on a prepaid cell phone?

keep it simple asked:

I have an at&t prepaid cell phone..i want to call my friend who lives in another country but it charges me 28 cents per minute which is way too much, i can’t afford it…so i was wondering if there was an easier way? i heard of tel3advantage but i dont think it will work for me because i believe i would still have to pay the 28 cents…can anyone help me?

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i have an international prepaid cell phone from vodafone. im heading off to kosovo and was told it would work?

ArtSiNister asked:

but my problem is, is that i have a number that will let me use my calling card but a 550 min calling card only gives me 70 mins of talk time. is there a free number that allows me to have free mobile to mobile or a number that allows me to get at least the state to state rate?

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