If you use it on the carrier the particular model is designed to work on, any phone will work on Straight Talk. (They're a network, not a carrier - phones work on carriers - money works on networks. IOW, you're paying Straight Talk, but AT&T, Verizon, etc.) Go to http://stbyop.com/straighttalk/check-compatibility.html to check whether your particular handset will work. (AT&T and TMobile will - most Verizon phones will. Sprint is iffy.)