You seem to have found some old legislation.

A reputable motoring magazine explains it pretty well.

https://www.parkers.co.uk/car-advice/mobile-phones/new-law/

The particularly relevant section is

Is it legal to use a phone as sat nav?

Yes, it is. However, you can’t touch your phone for any reason while driving. If you need to touch your phone to accept a route change or set a new destination, stop in a safe place and turn the car’s engine off to do so. Or use your phone’s voice controls.

https://www.digitalphablet.com/infotainment/top-countries-with-strict-laws-on-phone-use-while-driving/

Suggests otherwise.