That should be possible. But without a hack, even though those people still show up, doesn't it say "xx is at work, UNLIKE SOME PEOPLE I KNOW" and other messages like that? Or "xx doesn't have a phone".
I think the idea is for them not even to show up as being available to call so you don't waste time calling 4 or 5 people until you finally find someone home.
ChristianLov has
this.You can call anybody at any time and they will answer.
This is a different from what the OP has requested, although it accomplishes the same for people with a phone. Calling sims in the Sim Bin will still produce the "doesn't have a phone" message. I've gotten around that buy giving everyone my sims meet a cell phone. You can then call sims in the Sim Bin.