Using an unlocked phone with Straight Talk requires compatibility with the networks available in your area. You can use Straight Talk's phone compatibility tool at their website to check if your device is compatible.
Straight Talk offers different options to activate your phone depending on the type of technology your desired device uses. Any unlocked GSM phones operating in 850 and 1900 MHz bands or a phone that is compatible with AT&T or T-Mobile networks will work with the appropriate SIM card from Straight Talk. However, only certain CDMA phones will work with Straight Talk, so their website requires verification that your specific device will work on their system before you can purchase an activation kit.