Choose an approximate time and then tell him or her in the telephone. About calling the telephone, there are some skills. There are materials related to this, baidu it by yourself, I forget the link. Check this one:http://www.bihailantian.net/Html/qzzn/2006-5/11/140059847.shtml, and baidu more, I remember there are more useful information about this, I was interviewed on May 7th last year.