Historical clue formulations

• Company that merged with Sprint in 2020 — 2024-04-03
• Telecom with a pink logo — 2021-06-20
• So-called "America's Network" — 2021-01-16
• Big name in cell service — 2019-05-15
• Sprint competitor — 2018-02-08
• Sprint competitor — 2017-05-30
• Carrier with a pink logo — 2014-03-01
• Sprint competitor — 2008-03-28
• Big name in cellular service — 2007-06-20
• Sprint competitor — 2007-05-18