Where I live (most of the time) very few people have land lines, everyone has a cell phone, and I hear one go off at almost every Mass I attend, regardless of the day or the hour. Mostly I remember to put mine on vibrate, and the few times I have forgotten it has not rung.
…But how about when it’s the priest’s phone?! At the parish I belonged to a few years ago the priest used to remind people before the service started to switch their phones off. One memorable Sunday, during his homily, a cell phone rang persistently, the ringing coming from the Vestry, one embarrassed priest!
On another occasion, when I was working as a secretary at the same church, one of the priests was going to celebrate a weekday Eucharist at one of the chapels in the district. Just after he left the office, the chapelwarden phoned to ask for some more candles to be sent out. I quickly phoned the priest to ask him to wait while I got the candles as he was probably still in the parking lot. Now how was I to know that he was in the Vestry, getting his prayer book, with his phone on its loudest setting, while there was a service taking place in the church and the door between the church and the vestry was open to get the benefit of the breeze.