Cricket Wireless is owned by AT&T, but is structured less like a side ... T-Mobile-owned Mint Mobile has made a fairly big splash as a prepaid carrier with clever marketing and appealing promotions.
For this article, I'm going to focus on just a few: Boost Mobile, Cricket, Mint, Google Fi Wireless, US Mobile, MobileX, Tracfone, Metro by T-Mobile, Total Wireless, Verizon Prepaid and AT&T Prepaid.