The company also said on Twitter that people will not have to upgrade to iOS 11 to keep playing Pokémon GO after February 28, 2018, as it will be possible to play on compatible devices running iOS 9 or later.
The reason for the discontinuation is attributed to the fact that the game has been updated.
The change will take place on February, 28 of this year and will make iPhone 5, iPhone 5c, 1 generation iPad mini, iPad 2, and 3 and 4 generation iPads incompatible with the popular mobile AR game. The new version will not work on iPhone 5, iPhone 5c smartphones.
Apple has a history of rarely looking back on anything it has moved beynd - it won't re-incorporate hardware that it has once removed, and it certainly won't let you use older versions of its iOS once you've updated your device. After this date, those using Apple devices that can not be upgraded to iOS 11 will not be able to access their Pokemon Go accounts or use PokeCoins or other items without switching to one of the supported devices on Niantic's.
If you are now playing Pokemon GO on older smartphones, you can work with it until February 28.
Almost a month ago, Pokemon Go developer Niantic that Apple devices from the iPhone 6s and above would support AR+ - a new mode that takes advantage of Apple's ARKit framework for a greater degree of realism. If you are an active player, you should take adequate steps to migrate to a smartphone loaded with iOS 11 to continue to experience the new possibilities of the Pokemon GO.
It's unclear how iOS 11.2.2 affects performance on other iOS devices. Going forward, the upcoming versions of the Pokemon GO will work only on latest iOS operating platforms.