You can use devices with hands-free access, as long as you do not hold them at any time during usage. Hands-free access means using, for example:
a Bluetooth headset
voice command
a dashboard holder or mat
a windscreen mount
a built-in sat nav
The device must not block your view of the road and traffic ahead.
Staying in full control of your vehicle
You must stay in full control of your vehicle at all times. The police can stop you if they think you’re not in control because you’re distracted and you can be prosecuted.