Mobile virtual network operator - Wikipedia
https://en.wikipedia.org/wiki/Mobile_virtual_network_operator
A mobile virtual network operator (MVNO) is a wireless communications services provider that does not own the wireless network infrastructure over which it provides services to its customers.
The Best MVNOs for 2021 | Digital Trends
https://www.digitaltrends.com/mobile/best-mvno/
MVNOs offer low-cost prepaid services. If you feel like you're paying too much for your cellular service, consider using a Mobile Virtual Network Operator (MVNO) instead of the more expensive...