They use TMobile and AT&T.
Thanks, in your previous message, are you saying some people are put on AT&T and others are on TMobile but not both?
This is what I found:
"Boost Infinite is powered by AT&T, T-Mobile, Dish Network, or a combination of the three. At launch, Boost Infinite provided either an AT&T or T-Mobile SIM card, however, some users now get Rainbow SIM cards which offer dynamic network switching between Big Blue, the Un-Carrier, and Dish Wireless's towers. It works similar to how Google Fi operated initially, which hopped between T-Mobile, UScellular, and Sprint (Goodnight, sweet Sprint) based on which network was strongest. Some cell phones like the iPhone 15 series support Boost Infinite network switching, but other smartphones don't.
With the second-best 5G and 4G LTE networks in the U.S., one of Boost's host carriers, AT&T, balances mobile data speeds with reliability for strong signal strength from the cities to rural areas. Boost Infinite also runs on T-Mobile towers, either in conjunction with or instead of AT&T cellular signals. With T-Mobile, you'll enjoy the best nationwide 5G network, far outstripping Big Blue and Verizon. But The Un-Carrier's 4G LTE footprint falls short to Big Red and AT&T.
Unlike major carriers, Boost Infinite doesn't operate its own towers. Rather, the wireless company piggybacks off T-Mobile's and AT&T's towers.
At launch, Boost Infinite exclusively used AT&T towers. However, Boost Infinite now uses the Dish, AT&T, and T-Mobile networks depending on your plan and phone. Notably, some smartphones and plans are still limited to either AT&T or T-Mobile, with Boost Infinite's so-called smart network which dynamically switches between networks reserved for compatible phones, like the iPhone 15 series on select plans.
Some carriers like Red Pocket Mobile and US Mobile let you choose your network, but you still have to pick only one. Boost Infinite intends to offer dynamic switching between Boost Infinite's Dish Network, AT&T, and T-Mobile towers based on which network delivers the best experience in the moment. The future network switching feature would operate similarly to Google Fi's original implementation, which seamlessly hopped between Sprint, T-Mobile, and US Cellular. However, you need a phone with Band 70, like the Apple iPhone 14, to access Dish's network on Boost Infinite."
Sister carriers Boost Mobile and Boost Infinite have combined into one Boost Mobile.
www.whistleout.com