Ultra Mobile is a U.S.-based prepaid mobile carrier (MVNO) operating on the T-Mobile network. It offers flexible, no-contract plans with unlimited talk, global text, and affordable international calling to over 80 countries. The service supports data rollover, mobile hotspot use, and Wi-Fi calling. Acquired by T-Mobile in 2024, Ultra Mobile targets users seeking reliable nationwide coverage and strong international connectivity at competitive prepaid rates.