WhatsApp is finally pulling the plug on the App for all windows phone by the end of this year. It will also end support for older Android and iOS smartphones by Q1 of next year which is by February 2020.
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WhatsApp was supposed to end support for the windows mobile platform by 2020 but it had to backtrack since Microsoft already announced that it will no longer be supporting Windows phone.

If your device is running on Android version 2.3.7 and older, then WhatsApp will stop working on your device starting from February 1, 2020. Also, if you have iOS 7 and older currently running on your device, you will no longer be able to use WhatsApp starting from February 1, 2020. WhatsApp will however stop working on all windows phone as from December 31, 2019.

Note that some WhatsApp features might stop working on those above mentioned platforms and OS versions even before the deadline as WhatsApp has already stopped development for them.

Also, you can no longer create new accounts, nor reverify existing accounts, as of right now if you are using any of these older Android and iOS versions, but you can still do that on your Windows phone.

0ppa:
With this unnecessary discontinuance of some platforms, Whatsapp may like be a parody of BBM soon, then Facebook will follow, then Instagram.
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Let's just wait and see another Tech Wizard develop another instant messenger big thing: this time Facebook will not be able to buy or outrun it.
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Nonsense!

Blastedholligan:
The brands failed to make themselves relevant but discontinuing WhatsApp isn't nice cos some people still use Windows devices.