Considering I grew up where I was not allowed to receive phone calls after 9 PM, that is a bewitching hour in this house.
HOWEVER, I *have* made calls past then if necessary. I don't like to do it but sometimes will. Not usually to people I don't know though. I know one of my son's moms works at the library that closes at 9 pm, so I figure it's OK to call up to about 9:30ish or so if I have something to tell her. Yesterday her son left his boots in my car. By the time I got done with everything though it was too late to call, so instead I called early this morning which I hate to do just as much but I didn't want them running around the house looking for his boots (It was about 7:35-7:40 AM when I called & since school starts at 8:10, I figured I was *safe* calling then).
I know my DD has a friend that has called at 9:30 before, I have just stated with the no calls past 9 pm for her too but we do let it slide on occassion.