I think it's more just that people want a real-time way of communicating with you.
And Skype doesn't count because not everybody can skype on their phones. What happens if someone needs to contact you to tell you that they're running late?
> What happens if someone needs to contact you to tell you that they're running late?
That's actually one of the greatest benefits of not owning a pocket computer: people feel a lot more pressure to be on time. Old-fashioned: you set an appointment ahead of time and you keep it.
And Skype doesn't count because not everybody can skype on their phones. What happens if someone needs to contact you to tell you that they're running late?