Talk about phones and computers, talk about phones and computers.

You must install VoIP software to make a call. Mainly, you can dial any domestic phone number you want directly through the computer, which is cheaper than ordinary mobile phones. Free is only for advertising. So, just for you to experience. Free is not safe. Like me, there are many long-distance calls, and a month's telephone bill costs a quarter of my salary. This can save more or less, and it is much cheaper to call with traffic. There are many more. You can hide the number.