The host doesn't display the number, so call me all day. How can I block it?

For iphone, you click on that number to see the details, and then there is an A at the bottom to stop this contact from calling, just click OK, but to be honest, there is a problem, because most calls that don't display the number are made through skype, and once blocked, you can't answer any calls in this area, so you have to evaluate for yourself whether it will block other calls. In addition, it's best to find someone who calls you and talk to TA directly, which will completely solve the problem, because you don't need skype to call you, and you can call you at any time through some dialing software.