If T-Mobile US porting ratios with other leading U.S. mobile service providers were as high as 3:1 in 2014, it appears that competition has toughened since then.
In the second quarter of 2015, it appears T-Mobile US postpaid account porting ratios with AT&T were more like 1.9 to one. And the porting ratio with Sprint might have been as high as 4:1.
T-Mobile US did better against Sprint, obtaining a porting radio of about 2.5:1. T-Mobile US porting rations with Verizon Wireless were about 1.5 in the second quarter.