Straight talk wouldnt work. CDMA phones dont use sim cards. Straight talk uses a ton of different networks, but basically depending on which phone you buy from them determines which phone you use. Like the ones that have sims in them use t-mobile or AT&T's network, and the ones that dont are CDMA phones that use Verizon and Sprints network. And they unfortunately wont activate any phone on their service that isnt bought specifically with Straight Talk branding, and the Sim cards are also locked to Straight talk phones.