If you are not sure if your Straight Talk phone is using the AT&T, Verizon, or Sprint network the best way to find out is ask Straight Talk customer service. You can call them on the phone but I think it is better to use Live Chat. Visit https://support.straighttalk.com. Click the Contact Us button and choose Chat Live Agent.
In 2020, you have a lot of choices for prepaid wireless service. You may be able to save $100s per year and get the features you want such as Wi-Fi calling, Mobile Hotspot, and Visual Voicemail. Sound good? to learn more see, Is Straight Talk Your Best Option in 2020?
Ask the agent…
“Hi, My phone number is (###) ###-####. Can you tell me if my phone is using Straight Talk’s AT&T, T-Mobile, Verizon, or Sprint towers?”
Make sure to replace (###) ###-#### with your phone number.
If you need a new SIM you can order one from Straight Talk for a dollar. If your phone is using the Verizon towers, see Transferring Your Straight Talk Verizon Service to a New Phone
If your phone is using the AT&T or T-Mobile towers, see
Moving Your Straight Talk SIM Card To Your New Phone