R.J.
ROFL.... "ALL divorced people" hmmm? Not so much.
The trend is toward 50/50... but that's new (and not even the most common). The MOST common schedule I know is 1 parent is "full time" and the other is every other weekend. Sometimes with a single weekday evening thrown in for dinner.
My *favorite* schedule I've seen is one of the most uncommon. It's not quite 50/50 but it's close (because during the school year the child is gone 8 hours a day).
School Year
M = M-Fri morning
D = F afternoon (pick up at school) - Mon morning (drop off at school)
Summer
Reverse. With Mom on weekends and Dad during the week.
This way each parent has the child(ren) each week, are both involved with school... but there's no school week confusion and no "playdate-schedule-shuffle". No HW left at the wrong house, or this week it's this but next week it's that. It's just simple and direct.
As far as phonecalls go... With elementary kids it's really common for them to call the other parent right after dinner/ right before the bedtime routine. With older kids... it's 50/50. Some call the other parent all the time, some don't.