You can see how the end-of-support plans relate to your phone here. 'For Lumia 640 and 640 XL phone models, Window 10 Mobile version 1703 was the last supported OS version and will reach end of support on June 11th, 2019,' Microsoft says. It's worth noting that only phones capable of running version 1709 will be supported until December. Microsoft has held the hammer over the last nail in Windows 10 Mobile's coffin for some time - it released the last update, version 1709, in October 2017. Some services, including photo uploads and restoring from backups, may still work for up to a year after Microsoft formally ends support in December. You'll be able to create device backups for settings and some apps until March 10th, 2020.
The company will stop releasing security and software updates on December 10th, and it will end technical support for the devices on that date. Microsoft is winding down support for Windows 10 Mobile.
