Dear Samsung users:
According to your description, please:
1. It is recommended to enter Settings-Applications-All-Mobile Phone/ Contacts - Clear Data/Clear Defaults Try.
2. Back up your important data and try to reset the phone
If the problem persists, please go to the nearby Samsung service center for inspection and repair
Suggestions You make an "appointment in store" maintenance application on Samsung's official website to enjoy priority maintenance services: /pre-booking
After a successful appointment, please bring your machine, invoice and warranty card to visit the service center you reserved on time .
For comments, suggestions, and complaints, please click: support.samsung.com.cn/survey