The reason for the discontinuation is attributed to the fact that the game has been updated.
iOS: If the kid doubling as a monster wrangler in your life is hooked on catching oddly-shaped fictional animals (or if you're addicted to the game yourself), you'd better hope they have got a recent phone on which to play their favourite game. Unfortunately for some players, an upcoming Pokemon Go update will also make it unplayable on some older iPhones. 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.
Apple has released a new beta version of iOS for developer testing. iOS 11.2.5 beta 5 is now available on the developer center and over-the-air.
If you are now playing Pokemon GO on older smartphones, you can work with it until February 28. Those that try to play on an old device after February 28 may not be able to access their account or use PokeCoins and other items in their bags.
Pokemon Go continues to receive new features through regular updates, such as the improved AR mode that rolled out for the game last month.
Following last week's discovery of the massive Meltdown and Spectre security vulnerabilities, Apple quickly put together a software update meant to patch the issues, which took the form of its latest iOS 11.2.2 software update. It takes advantage of the ARKit Framework to enhance the AR-capabilities with support for iPhone 6S and above devices. We'll update to the latest versions and note any changes below.