been in a court a few times (divorce), to start with they wanted ALL phones checked in, this relaxed to camera phones, which they WILL find at the security sweep, other phones had to be off in te court rooms but were fine in the corridors.
this appears to have now changed to any phone is ok, but off in the court rooms themselves. there are signs about no photographs, apparently its an offense of some sort, probably some sort of 'security' offense, along with everything else these days.
I guess when a phone with a camera was a novelty taking them off you worked, but now just about everyone has one its probably too much hassle for them to bother with. plus I dare say it was pointed out that if they took your phone.. hey had some liability to give it back...