In the Netherlands, it is prohibited to use your phone while cycling. Do not use your phone while riding, and vice versa. In addition to being illegal, it is also very dangerous as it diverts your attention from the road.
The fine for using a phone while cycling is 95 euros, so make sure to comply with the law.
On our bikes there will be phone mounts installed so that you can see your navigation or order details and you don't need to hold the phone in your hand.