Millions of smartphone users will soon no longer be able to use WhatsApp as the messaging App will stop functioning on aging smartphones in just a matter of days.

Over 49 smartphone models will no longer receive updates to support the use of WhatsApp from December 31st when the update is deployed.

“To keep up with the latest advances in tech, we routinely stop supporting older operating systems to point our resources to supporting the latest ones,” a spokesperson for the app said.

WhatsApp is one of the most popular messaging apps in use, with the company boasting more than two billion users in more than 180 countries. Here are the list of affected phones/devices:

iPhone 5        iPhone 5C     Archos 53 Platinum      Grand S Flex ZTE     Grand X Quad V987 ZTE

HTC Desire 500     Huawei Ascend D      Huawei Ascend D1      Huawei Ascend D2

Huawei Ascend G740      Huawei Ascend Mate       Huawei Ascend P1       Quad XL

Lenovo A820      LG Enact        LG Lucid 2        LG Optimus 4X HD        LG Optimus F3

LG Optimus F3Q       LG Optimus F5       LG Optimus F6         LG Optimus F7      LG Optimus L2 II

LG Optimus L3 II        LG Optimus L3 II Dual           LG Optimus L4 II         LG Optimus L4 II Dual

LG Optimus L5           LG Optimus L5 II          LG Optimus L5 II Dual          LG Optimus L7       

LG Optimus L7 II         LG Optimus L7 II Dual        LG Optimus Nitro HD          Memo ZTE V956

Samsung Galaxy Ace 2           Samsung Galaxy Core       Samsung Galaxy S2       Samsung Galaxy S3 Mini

Samsung Galaxy Trend II       Samsung Galaxy Trend Lite       Samsung Galaxy Xcover 2

Sony Xperia Arc S       Sony Xperia miro         Sony Xperia Neo L      Wiko Cink Five    Wiko Darknight ZT