WhatsApp, the most popular messaging app in the world, is about to stop working on thousands of phones, writes metro.co.uk.

The Facebook-owned app is set to stop support for older phones around the world on November 1, 2021.

It will cease to function on up to 43 different smartphone models as it shifts the requirements for the Android and iOS operating systems.

In the FAQ section on its website, WhatsApp says people should use phones running Android version OS 4.1 or iPhones running iOS 10 and newer.

Here’s a list of smartphone models that WhatsApp will stop supporting from next week. That doesn’t necessarily mean the app will cease to function – but it does mean you’ll no longer be able to download patches and updates, which could leave it open to crashes or bugs or – in some cases – security exploits.

Apple
The iPhone SE (2016), 6S and 6S Plus. These models launched with iOS 9 but can be updated through to iOS 15 to continue to support WhatsApp.

Older iPhones that cannot be updated past iOS 10 will lose access. At present, that now includes the iPhone 4S from 2011.

Samsung
The Samsung Galaxy Trend Lite, Galaxy Trend II, Galaxy SII, Galaxy S3 mini, Galaxy Xcover 2, Galaxy Core and Galaxy Ace 2.

LG
The LG Lucid 2, Optimus F7, Optimus F5, Optimus L3 II Dual, Optimus F5, Optimus L5, Optimus L5 II, Optimus L5 Dual, Optimus L3 II, Optimus L7, Optimus L7 II Dual, Optimus L7 II, Optimus F6, Enact , Optimus L4 II Dual, Optimus F3, Optimus L4 II, Optimus L2 II, Optimus Nitro HD and 4X HD, and Optimus F3Q.

ZTE
The ZTE Grand S Flex, ZTE V956, Grand X Quad V987 and Grand Memo.

Huawei
The Huawei Ascend G740, Ascend Mate, Ascend D Quad XL, Ascend D1 Quad XL, Ascend P1 S, and Ascend D2.

Sony
The Sony Xperia Miro, Sony Xperia Neo L, Xperia Arc S.

Others

The Alcatel One Touch Evo 7, Archos 53 Platinum, HTC Desire 500, Caterpillar Cat B15, Wiko Cink Five, Wiko Darknight, Lenovo A820, UMi X2, Faea F1 and THL W8.