It’s difficult – why do you, the customer, want me to call you? If I’m fixing your bike, then I’ll call you as soon as its done because, basically, I want it out of my workshop and the money in the till. Equally if you’ve orders something and it’s come in, then I’ll definitely call you right away.
But the tricky ones are people who want “regular updates” – quite often all I can say about something is that I’m still waiting for something to come in from a supplier. It’s more difficult to take time out of a busy day to call someone and say “nothing to tell you yet”.
Also, it’s very, very common for me to call people and not get an answer – I always leave a message if there is the opportunity, but at a guess less than 10% of people listen to their voicemail.