There is no popup window. I got a call from a streaming phone. What happened?

Mainly to communicate and understand some recent trips and people who have contacted, etc. And obtain more epidemic information through relevant information, which is conducive to epidemic prevention and control. Don't panic when you receive a cell phone call, just answer the relevant questions. Most things that need to be reported to the community need to be isolated. What should I do if I receive a transfer call? Citizens should not be nervous when they receive a transfer call.