Both the VanMoof S5 & A5 have a removable phone mount at the centre of the handlebars. In order to attach your phone to your bike, you'll need to get your hands on a SP Connect phone case which you can find in their webshop for most phone models.
Keep in mind that the phone mount on the S5 & A5 is 'SPC' and not the newer 'SPC+'. Most phone cases are shipped with an adapter.
When you've attached your phone, you can charge your phone using the USB-C port on the handlebar.