Phones in the Temple

Today Denton and I were officiating in a session in the Guatemala Temple. All of a sudden we hear a cell phone buzz, A sister reaches down her blouse and pulls out her phone. She turns it off and sticks it back down her blouse' At the next stopping point I ask her to come with me. I tell her she needs to put her phone in her locker. She is a little put out with me and says"I turned it off". I told her that phones do not ever belong in the Celestial Room let alone in the Temple and she needed to put it in her locker. She did and we walked back into the session. Really now! why would you take a phone into a session!?