What is it that Apple's mobile phone always shows fine inspection and fine repair to ensure safety?

If Apple's mobile phone leaks electricity when charging, users are advised to stop charging as soon as possible. Then send the mobile phone and charger to the brand customer service as soon as possible, and the customer service user will explain the situation and let the customer service test it. If there is a problem with the mobile phone or charger, the customer service will inform the user. The warranty period of Apple mobile phone is 1 year. If the mobile phone is in the warranty period, it is a natural failure, and it is responsible for the warranty after sale. If it is caused by insurance or human failure, it can only be repaired.