https://wccftech.com/microsoft-ditch-windows-10-mobile-move-android-ios/

Microsoft has updated the Windows 10 Mobile support page and while we all knew the operating system was dead, the end of support is here. The company is officially recommending its Windows 10 Mobile users to move to Android and iOS. The Windows maker wrote that “as of December 10, 2019, Windows 10 Mobile users are no longer eligible to receive new security updates, non-security hotfixes, free assisted support options, or online technical content updates from Microsoft for free.”

Not all devices will be supported through the end date, either. Microsoft writes that for Lumia 640 and 640 XL phone models, Window 10 Mobile version 1703 was the last supported OS version, which will reach end of support on June 11, 2019.