WhatsApp is to stop working for millions of older smart phone users on New Year's Day.
The messaging app will no longer support iOS 9 systems, the operating software released by Apple in 2015.
Android users with older devices will also be affected if they use Android 4.0.3.
Software update iOS 9 was the last the iPhone 4 could receive, with later models able to upgrade to newer versions.
This year, Apple released iOS 14 in September 2020.
Devices 4S, 5, 5S, 5C, 6 and 6S can all be updated in order to keep using WhatsApp on their device, reports the Daily Mail
The move to block services on older handsets is a common tactic of app developers to frees up resources to be focused on improving the product for the majority of users who have more modern handsets.
Facebook-owned WhatsApp is one of the world's most popular apps, with an estimated two billion users.
Phones which can no longer be updated to a supporting system are expected to lose their ability to use WhatsApp on the first day of 2021.
The Mirror Online has approached WhatsApp for a comment.
