Microsoft releases Windows 10 for the Lumia 640 and Lumia 735
Redmond, Wash. — If you’re on American Telephone & Telegraph (AT&T) Mobility or Verizon Wireless, two phones released at this time last year are getting Windows 10.
The AT&T version of the Microsoft Lumia 640 and the RM-1041 version of the Lumia 735 has been confirmed by Microsoft to get Windows 10. The update should tentatively go live any moment now.
— Dona Sarkar (@donasarkar) June 3, 2016
Right now, it is unknown whether the two phones will be receiving build 10586.338 or 10586.420, the latter of which is being tested internally by Microsoft. It is also not known when the Cricket, MetroPCS and T-Mobile variants of the Lumia 640, or the RM-1063 variant of the Microsoft Lumia 640 XL for that matter, will get the awesome Windows 10 update.
As far as the carriers that are holding up the updates go, this is why Microsoft decided to release the operating system updates on Windows 10 on their own – without AT&T, Verizon or T-Mobile.