iPhone users to be given option to turn off feature that slows down devices

Apple chief Tim Cook says update for iOS will provide new option, but urges against using it for risk of sudden shutdown problems

Apple will give users the option to turn off a feature that temporarily slows down older iPhones in order to prevent unexpected shutdowns, chief executive Tim Cook has said.

The new option is likely to arrive in March, as part of the next update to iOS 11. "If you don't want it, you can turn it off," Cook told ABC News. The CEO maintains, however, that Apple "don't recommend" users take advantage of the ability to disable the slowdown.