Starting today, two more smartphones are receiving updates to Windows 10 Mobile. We're talking about the AT&T version of the Microsoft Lumia 640 and Verizon's Lumia 735 model. Both of them are now in the process of being updated to Windows 10 Mobile over-the-air.
Obviously as is always the case the rollout is happening in phases, so a few days (if not more) will pass before everyone who owns one of this phones gets the much anticipated update notification.
If you have AT&T's Lumia 640, go to the Upgrade Advisor app if you want to manually check for the new software. If you own Verizon's Lumia 735, go to Settings > Update & security > Phone update then tap on Check for updates to achieve the same goal.