We're having our reception at FI's parent's country club. We reserved the date and they just sent us a letter reminding us of club policies that they expect to be followed (we can't post a huge neon sign out front, no minors drinking, etc). One of their policies is no cel phone usage at the clubhouse. People can have their phones on silent and read texts/listen to voicemail, but are supposed to use the clubhouse phones for all conversations and keep ringers off.
My question is how, if at all, should I communicate this to our guests? I don't want to be a bitch, but I also don't want my FIL's getting complaints from their country club because other members saw/heard guests on their cel phones in public areas (lobby, patio, etc).
What do you think the best way to handle this is?