T-Mobile and Crown Castle Sign 12-Year Agreement to Expand U.S. 5G Coverage via Macro Towers, Small Cells, and Fiber Thursday, January 13, 2022 By Stillness in the Storm Leave a Comment (BN Frank) AT&T and Verizon agreed to delay their U.S. 5G expansion until January 19 due to increasing concerns about aviation safety risks. Of course, T-Mobile and Crown Castle have plans for 5G expansion too.