I am at home

because the mechanic for the heating maintenance was 45 min. late. He says he tried to call me. I say I was home and would have heard a call. He shows me the number: it is my work number because that is where I can be reached during the day. How should I know he would try to call me at 7a.m. to tell me he will be late?

So give out your mobile number if you want to be sure not to be waiting in vain.