AT&T has reported slower sales and 900,000 fewer smartphone upgrades for the past quarter, which includes more than a week of iPhone availability.
Historically, iPhone sales are strongest in the first days of availability and in the Holiday quarter, so this is clearly a troubling sign. While AT&T does not break down unit sales by model, the iPhone has been the dominant phone on all US carriers in the past few years, so this clearly has a lot to do with lower demand for the iPhone 8.
This can be explained in … – Source