Straight Talk is owned by TracPhone. TracPhone piggybacks off of the major carries (Verizon, AT&T, Sprint). In order to find out which provider you have, you can try a few different things:
- Send a text to your email address to see what text address comes through as the sender. For example, "firstname.lastname@example.org" would be from Verizon.
- Turn your phone off and then back on to see which provider is listed as the phone starts up.
- Check your the area where your battery or sim card is stored on the phone, sometimes the provider is listed in that area.