Did the usual "phones, please" thing and the DP relayed it to some other crew, and said about how phones ruin takes/distracting it is.
Next take, a phone goes off. I had a bit of a whinge, as did the 1st, as did a few people........ The phone belonged to the DP.
Forgot to put a battery in a radio once as well. Stupid mistake, luckily camera didnt do a great job so i went to "swap" the battery and all was sorted.
Guess you learn by them