Apple encountered a large area of automatic shutdown of the iPhone 6s in November. It said that it would provide free maintenance services worldwide. On December 6, it revealed that the dial-up application was stuck. Some users said on Apple's official forum that there was a system problem with their mobile phone. The phone app might get stuck when using Bluetooth headsets to make calls, check call records, and set settings. No matter how soft restart or iTunes reset is used, it cannot be resolved.

This time, the problem is another bug after the loss of health application data in iOS 10.1, involving iPhone 5s iPhone 6/6s， But this time, the possibility of hardware related is very low. Foreign users have also figured out some solutions to deal with this problem, such as operator network reset and closing the Exchange contact synchronization function.

Every system will inevitably have bugs, and the iOS, which has always been known for its stability, has been plagued by various minor problems after updating to iOS 10. But as a mobile phone, it's ironic to get stuck in the dial-up application

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