Just received an email from Tello with the following statement:
"You can now enroll devices from AT&T, T-Mobile and Verizon with us. A bunch of devices joined the list of Non-Sprint Devices that are eligible for activation. Devices such as iPhone XS, iPhone XS Max and iPhone XR are on the list."
The phones on the list are all multi-carrier phones with Sprint network capability. It does not appear that Tello is expanding to use other networks.
Yep. This means Tello either just learned they have they ability to add Sprint-eligible devices via DNA2 in their Sprint API, or they hired someone who does.
ting.com/byod has done this for a while.
In either case good on them!