It depends on what make and model it is.
Here are some phones that can be used as pre paid.
PREPAID PHONES-- KIYOCERA --KWC 2325, KX414 -- MOTOROLA -- MotoW755, RazrV3m, V376, W385 -- PANTECH -- Jest -- Verizon -- Blitz, CDM7075, CDM8615, DM7076, PN215 --
LG 6015i-- Accolade, Chocolate, Cosmo, VX3200, VX3450, VX5200, VX 5400, VX5500, VX6100, VX7000, ENV --SAMSUNG--Alias SCHu740, Gusto, Haven , Intensity, Juke, SCHA650, SCHA870, SCHU340, CHU410, SCHU430, SCHU540, Smooth --NOKIA -- 2128i, 2366i, 2650 Mirage, 2705 Shade
Yes as long as it doesn't have extreme features such as internet ready, push to talk, and stuff like that. If you doubt it just call up the prepaid 1 800 number and give them the make and model of the phone which is located under your battery. They will tell you if its compatible or not. Hopefully this helped!