Bring your Own Phone (BYOP) & Check Compatibility - Straight Talk
Are you kidding me. I just brought my own phone in. Only one of their T mobile sims would work. I really don't feel like calling their awful support team again. :
Straight Talk Keep Your Own Phone SIM Kit, No Airtime - Prepaid
4 Pack - Straight Talk SIM Card BYOP Bring Your Own Phone Sim Kit - Verizon Netowrk
Straight Talk Verizon 4G LTE 3G CDMA Bring Your Own Phone Activation Kit