This is a little off topic, but several have mentioned phones. I don't know of anyone personally who is without a phone, but I can hardly ever reach anyone I know by phone. I have to either text or leave a voice mail - then they normally do call me back, but it's hours later, when I'm in the middle of dinner, or in the shower and in no mood for conversation.
Knowing that might happen, I've left a voice mail message sort of like this: "Hi, I was just thinking about you and wanted to talk a bit, but I see you're busy. No need to call me back, all is fine here, and I hope you are too - catch you later another time." - And even then, I will get that dinner or shower time callback.
Maybe they were in the middle of something when I called them first, and that's why they didn't answer - I can understand that - but every time I call them? No, I don't think so.