https://www.cnet.com/news/t-mobile-continues-to-crush-it-in-attracting-new-subscribers/

The company said this was the best quarter ever in terms of attracting new customers. 

These additions likely top subscriber growth from its rivals. Just Tuesday, Verizon also announced strong customer growth for the fourth quarter, adding 650,000 new phone subscribers. But T-Mobile beat Verizon's growth.