WhatsApp will no longer work on a number of older smartphones in the new year.
Facebook, which owns the app, announced earlier this year that the service will be pulled from Windows Phone as it halts development on some older handsets.
The latest cut-off, which comes into force tomorrow, will be followed by dated versions of Android and iOS in a couple of months.
The popular messaging app will be axed from Android versions 2.3.7 and older, as well as iOS 8 and older, on February 1.
In 2018, WhatsApp stopped supporting earlier Windows Phones, as well as BlackBerry OS and BlackBerry 10.
Microsoft gave up on its smartphone efforts several years ago, but surprised the industry with plans to make a return in 2020.
In October, the firm revealed early details about a new foldable device known as the Surface Duo - though it's expected to run on Android instead of a Microsoft-developed operating system.
