The change is reflected in updated language in the Apple Store app, which now says that customers can join the iPhone Upgrade Program online with AT&T, Sprint, T-Mobile, or Verizon.
AT&T, Verizon, and Sprint users have been able to enroll in the iPhone Upgrade Program online since the program launched, allowing for online purchases of new iPhones, but T-Mobile subscribers who wanted to upgrade to a new iPhone using the iPhone Upgrade Program could not do so online like other customers for previous iPhone launches.
With this policy change, T-Mobile customers who plan to purchase a new iPhone using the iPhone Upgrade Program when the 2018 iPhones launch should be able to do so entirely online without visiting a retail store.
Apple last year offered pre-approvals for the iPhone Upgrade Program, which allowed iPhone Upgrade Program customers to get through the checkout process more quickly when pre-orders kicked off.
Apple is likely to offer the same pre-approval process this year, which customers of all carriers will be able to participate in. Apple also offered Trade-in kits delivered by mail last year, another option previously not available to T-Mobile users.
[via Reddit]