Straight Talk is a prepaid mobile virtual network operator jointly run by Walmart and TracFone that uses Verizon, AT&T and T-Mobile networks. Which network's service towers a device connects to varies depending on the device. Phones brought to Straight Talk from Verizon connect to Verizon's service network.
Mobile virtual network operators (MVNO) are small- to medium-sized mobile phone service providers that piggyback on the networks of larger network providers. MVNOs are generally prepaid services including Virgin Mobile, Cricket Wireless, TracFone and NET10.
The monthly cost of service using a prepaid MVNO is the same or less than that of a contract service provider in most cases. A single-line 30-day plan with a prepaid provider costs between $30 and $45, as of April 2015.