This phone use CDMA technology which is only compatible with the Sprint and Verizon networks, so all Tracfone ZTE Valet phones will be on one of these two networks. Verizon has much better nationwide coverage than Sprint. It may be possible to tell which SIM is installed (either Sprint of Verizon) based on the numbers on the package. You may need to Google to find out about this.
Hi Becky. That depends upon where you buy your phone or SIM card. Straight Talk phones can use AT&T, T-mobile, Verizon, or Sprint, depending upon where you purchase your phone, the ZIP code entered before you shop for a phone on Straight Talk’s web-site, and the specific model phone that you select. source