T-Mobile ranks No. 1 for 5G, download speeds, and coverage in Q1: Leading network carriers with extra 5G capacity can grow 5G subscriptions and solidify a foothold in the MVNO space through prepaid partnerships.
Prepaid brands like Cricket, Boost, Straight Talk, US Mobile will largely adhere to the schedule of whoever of the big three is providing their network bandwidth. Most carriers have a list of devices they expect to continue to operate, and most devices released in 2015 and onward should work fine. Once networks go offline, older devices will lose connectivity.