If you know this person, go and talk to him/her privately (as soon as possible) and tell him/her that that is unacceptable. And ask the church leadership to announce that foods and drinks are not permissible during services, and all iPhones are to left outside. If people will act like Kindergarteners, they have to be told the rudiments of good and bad behavior during a pubic meeting.
I have some issues with some of the church leadership or is it the board of this crunchy chip church. They just dont seem to have any effective leadership at all and cant seem to make decisions. Its like a revolving door. They dont give anyone straight answers and you try and do stuff but get given the run around. Im tired of it. So maybe should just be honest and say well if you dont receive what im offering to give then maybe i should shake the dust off my feet.