Pokemon GO will be discontinued for Apple devices that can't be updated to iOS 11
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Apparently, the new change will take effect on February 28 via an update to the game. The reason behind Niantic's decision to discontinue support for Apple devices that can't be upgraded to iOS 11 stems from that fact that improvements to the game are now pushing Pokemon GO “beyond the capabilities of the operating system on such devices.”
So, after February 28, if you own an Apple device still not running iOS 11, you will no longer be able to access Pokemon GO account or make use of your PokeCoins and other items in the Bags.
Your Pokemon GO account will not be lost, but you will need to switch to a supported device to continue to play the game. Here are all Apple devices that will be affected by this change: iPhone 5, iPhone 5c, iPad 4th Gen, iPad 3rd Gen, iPad mini, and iPad 2.
source: Niantic
Things that are NOT allowed: