T-Mobile put out a press release saying that the company has never seen such a high amount of sales in a single day. On Friday, when iPhone pre-orders opened, the US carrier says that the volume of sales (pre-orders) shattered previous records. In the first four days, the iPhone 7 and 7 Plus have sold about 4 times the amount of iPhone 6 and 6 Plus's in the same amount of time. As well, T-Mobile's continued efforts to shake up the wireless industry in the US have also brought more subscribers who ported in (switched from another carrier) than it did in Q1. T-Mobile has recently...
Source: http://www.gsmarena.com/tmobile_says_the_iphone_7_and_7_plus_are_the_bestselling_phones_on_the_carrier-news-20496.php