A: Define inappropriate.
Would an inappropriate time be when you are on a crowded bus and you get a call from a loved one who has lost their home in a fire and needs help?
Would it be inappropriate to place a call during your daughter's dance recital because you left her costume and home and you need your husband to pick it up?
Would it be inappropriate to use your cell phone during a funeral, even though the eulogy has been going on for over an hour and you barely knew the deceased and really didn't care for him and length of the service looks like it will interfere with your dinner date?
It would?
Oh, that explains why everyone is hissing and giving me dirty looks.
I'll take this call outside.