I generally don't phone up members of my tribe who are working parents, figuring they are up to their eyeballs in challenges most of the time, and that they will text or phone me if there's something they want me to know about. I might ship them an email with a cartoon once in awhile. I have always told them "You're the ones with less free time, so you pick a time to phone me instead of the other way around." It seems to work ok but probably because we're all close-knit and confident of each other's affections, and don't take offense over not hearing from each other all that often.
With nextgen who are in their teens or 20s, I text or email them on birthdays or just to say hi or set up a get-together, and occasionally will ask one of them to run a shopping errand for me if it's local for them and not far out of their way to drop stuff off here.
The kinfolk who are retired, I do phone up fairly often, if I haven't heard from them via email or gotten together with them someplace. They do the same with me.
On all this I'm guided by my own past experience of how I felt when I got phone calls at different phases of my life. Sometimes it was "oh not again, gee... does she think I have nothing better to do at 7:55am then fill her in on how I'm doing??!" and sometimes it was more like "Wow, how sweet of her to think to call me."
And to be honest there's always the answering machine, although if I'm home I don't filter calls, I generally will pick up and deal with whoever or whatever it is unless I'm in the middle of something that can't brook the distraction. Again, this works OK with people like my own kinfolk, who all seem to take it for granted that an answering machine is a useful device and not a method of avoiding contact with them in particular!
When it comes to imparting bad news, I'm not very good at it and I hate doing it, but at least I usually suggest the person sit down, by way of a clue that it's not a regular social call, and then I don't beat around the bush or mince words, just convey the facts as I know them and promise to follow up with email or another call later on as warranted.