only if its a Verizon CDMA Iphone 4s/5/5s/5c.... these are Global Ready phones, meaning the have both CDMA and GSM radios... and per FCC federal law, all CDMA global ready phones, regardless of OS or carrier, must be sold as GSM unlocked... so.......... go to www.straighttalkbyop.com..... read english.... choose between ATT or Tmobile service sim cards.... pay $56.79 total for sim card and 1 month or unlimited.... sim card arrived in mail.... pop it into the iphone.... update MMS and DATA APN settings via straight Talk byop site above......... reboot...... drink beer... enjoy