As we informed HERE, Apple updated some older devices because of time rollover issue. This issue will affect many services, like iCloud, App Store and GPS – they will stop working. Devices, which Apple updated, are iPhone 5, cellular version of iPad 4, iPhone 4S and cellular versions of iPad mini, iPad 2 and iPad 3. Though these devices are no longer supported and the latest main version for them was iOS 10 or iOS 9, based on model, Apple updated them. This level of support is a dream for Android users, which often won’t see more than one major release. My relative old iPhone 6s introduced with iOS 9 in 2015 will get all updates till September 2020 – it’s unlikely that my iPhone 6s will get iOS 14.
Till November 3, your older device – if you got one – will work normally. If you won’t update before November 3, over-the-air update won’t work and to update your device you will have to back up and restore using a Mac or PC in order to update. Don’t forget that iCloud backup won’t work too.
Official support document from Apple says:
Starting just before 12:00 a.m. UTC on November 3, 2019, iPhone 5 will require an iOS update to maintain accurate GPS location and to continue to use functions that rely on correct date and time including App Store, iCloud, email, and web browsing. This is due to the GPS time rollover issue that began affecting GPS-enabled products from other manufacturers on April 6, 2019. Affected Apple devices are not impacted until just before 12:00 a.m. UTC on November 3, 2019.
If you want to check if you have the latest iOS update installed, go to Settings -> General -> About -> Software version.
On iPhone 5 and iPad 4 Wi-Fi + Cellular, it should show iOS version 10.3.4
On iPhone 4S and cellular versions of iPad mini, iPad 2 and iPad 3, it should show iOS version 9.3.6
If you have older version of iOS on mentioned devices, just update, ideally before November 3.