This autumn will see the release of Apple’s iOS 11 mobile operating system, but it will not be available on the iPhone 5 and 5C or the iPad 4.
This means that, from this point, older Apple devices will not receive security or software updates.
In addition to this, while newer devices will be eligible for the upgrade, some of the older apps available on the App Store will no longer work.
This comes after Apple’s decision to end support for any applications or devices that use 32-bit processors.
Since 2013, with the launch of the iPhone 5S and iPad Air, Apple has been making devices that use 64-bit processors, rather than the older 32-bit processors.
Any apps that only run in 32-bit will not appear in search results in the updated version of the App Store, nor will they be available for the Purchased tab if they had previously been installed.
64-bit processors are capable of handling massively higher amounts of data at once, around four billion times higher than 32-bit processors, which make them much faster to use.
“Apple has been warning of this migration to its 64-bit hardware for a number of years, but this news will still undoubtedly blindside a number of its customers, ” Ernest Doku, a telecoms expert at uSwitch.com told the BBC.
“Most apps from the last four years or so should be compatible, unless they haven’t been updated since 2015.”
As part of last October’s release of Apple’s iOS 10.1, users that attempted to use a 32-bit app on their updated devices were given a message warning them that doing so may cause their iPhone to slow down.
Subsequently, the iOS 10.3 update included a tool that could detect apps that were unable to run in 64-bit mode.
Since June 2015, any newly created apps have been required to support 64-bit processing, so any that have been updated during this period should not be affected by the changes.
However, some educational apps and popular games have not been up dated since this requirement was introduced; these include
apps created by Fisher Price and WeeWorld, who created the WeeMe avatar app.
32-bit processing will also be phased out for Mac use, with Apple telling developers at WWDS that Mac OS High Sierra would be the last model to be able to use 32-bit processing “without compromises”.
From June 2018, all new apps submitted to the Mac app store will need to support 64-bit, and from June 2018 updates to existing apps must also be 64-bit compatible.
The update will also include a ‘driving mode’ which will mute notifications and can even send an automatic response to messages, informing the recipient that the iPhone owner is driving.