We are not - its in our school policies. They have to be kept turned off and ideally locked away. They can be in the classroom but off and out of reach/sight, ideally in a locked cupboard.
However - this only changed a year ago in response to an incident elsewhere - and not one where a child was actually affected in any way.
Before that we could make use of apps, camera etc as part of school work, etc.
Not all schools bar them though - in some there are used activiey. there are even special apps for recording evidence linked to EYFS and KS1 for example. We are trialling these on iPads now though.
And in secondary I know that in DD's school although technically they should be off and out of sight, even for children, in some lessons they are encouraged to used them for different educational purposes.
TBH for safeguading I am ntot convinced it is areally a major issue though. If someone really was that way included there would be ways and means, equally as accessible. Most classrooms have class cameras and video recorders for example - and teachers take their school laptops home, and memory sticks, etc.