UPDATE 2:04pm Well, I'm royally miffed at my wife right now. I had scheduled with her early in the week to call our son today at 4:30p (EST). I tried a couple more time until 4:45p and then I decided to send her the following text message:
"In the future, pls keep me informed if you aren't able to accept my call at the planned time. I'll try again @ 5p (your time) or we'll just reschedule."
I called at 5pm and still no answer.
I hope I wasn't too formal with my message. I want to get my point across that there is a reason why I pre-planned the call. My wife does the opposite; she calls when she wants to or can, without notice.