Obviously we have caller display.
DH goes to the pub on a Thursday night with his mates. DH has been going to the pub every Thursday with his friends for around 8 years.
Almost every Thursday evening FIL rings. I am bored of telling him every week that DH is in the pub, so tonight I didn't answer the phone
I know IABU (probably), but DH does have a mobile that FIL could ring on a Thursday if he really needs to speak to DH.