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How to get minutes for free on prepaid phones 
Find a promotional bonus code. 
A promo bonus code is like a coupon, in that you can give it to your prepaid phone service provider in exchange for whatever promotion the code is associated with. On occasion, a promo bonus code may entitle you, the code bearer, to free phone minutes.
1 way to find these promo codes is to search online for codes pertaining to your particular prepaid phone service provider. Qualify for a program that provides free prepaid phones and free minutes to low-income applicants.