Carriers like Net10, Straight Talk and Tracfone are what we in the business know as MVNOs. Basically, they buy airtime from big networks and give you the best coverage according to your location. The problem here is that your unlock code will not always work with these carriers. Some carriers like Verizon and Sprint are CDMA and unfortunately, wont work with any unlocked phones.
If you are planning to use your unlocked phone with Net10, Straight Talk, Tracfone or any similar carrier, you need to check first if they are giving you a GSM SIM card. This means that your airtime will run on AT&T or T-Mobiles network.
If you already have a SIM card but it runs on Verizon or Sprint, please contact your new provider and ask for an exchange. Your unlocked phone will work with your carrier once you do this. Please note that choosing the correct carrier that works with an unlocked phone is the client’s responsibility and our 100% refund guarantee does not cover refund for clients who wish to use their phone with a CDMA carrier.
Make sure you select a GSM activation kit (or one that uses AT&T or T-Mobile).