As you are (hopefully) aware, it is already illegal to text or make a call (expect in an emergency situation) when using a hand-held device whilst driving. As of 25th March 2022, the law will change to also include taking photos or videos, scrolling through music playlists or play games.
People caught doing so will face a £200 Fixed Penalty Notice (FPN) & up to 6 points on their license.
Drivers’ will still be able to use ‘hands-free’ devices; such a phones in place of a Sat-Nav device; provided it is secured within a cradle. Note, that this will no mitigate the responsibility they have concerning their driving & they can still be charged with an offence if the standard of their driving falls too low.
Upcoming changes to the Highway code will cover these changes – including the distinction that being ‘parked in traffic’ would still constitute driving; so the use of phones as traffic lights and/or motorway traffic jams would still be illegal.