While visiting (at different times) a local church I happen to see at separate occasions two weddings. I like to watch weddings and see the the bridal groups attire and the wedding dress thus I stayed and watched the ceremony and at both wedding ceremonies, heard the phone and noticed people will answer it. At both times the minister asks people to turn the phones off or silent (so that if they really need to make contact still can and take it outside) but just a few moments after, some ones phone rang. I think it was during the vows or speaking moment.
Another time, this year, when I was at a funeral (fellow volunteer), someone had their phone on and it rang, she even answered it, only a few seat from me. How weird is that.
Even if they're texting the message it is still a weird and odd thing to do, rather take it out and text.
Also most of the ring tones are not funny nor appropriate in such situations (weddings, funerals).
Nor appropriate at other places such as cinemas and choirs performances and stage plays.
Hugh was correct in telling that person as it is. If a person can't handle being without phone contact at such times, they should not be there.
Before mobile/handies/cell phones what did people do. They are way to attached to their phones.
I don't have a phone (use public if needed).