Mobile phones are used by staff during maintenance.

If you have evidence that the message and phone call were made by the maintenance master, you can claim compensation from him if the call duration exceeds the test cell phone time (that is, 2 to 5 minutes). And you can ask him to clean up the appearance of the phone. As a mobile phone maintenance master, I am ashamed to see the master above do this to your mobile phone. I apologize to you on behalf of some honest maintenance masters. We generally don't ask customers to leave their calling cards (SIM cards), mobile phone back covers and batteries when repairing the machine. For people who are not afraid, there should be some unnecessary misunderstandings. If you want compensation, you must deal with it quickly. After a long time, you will deny it. However, I want to remind you that you should try not to leave your mobile phone at the master's place for the next maintenance. It is best to repair it and take it away the same day.