Tap the phone icon on your home screen, then either tap a contact name or the dialler icon (centre-bottom). In the case of existing contacts that have multiple numbers (eg landline and mobile), you will be asked to choose which one to dial. To save having to always select which number to dial, just tick the box that says ‘Remember this choice’ at the bottom of the number selection menu.
Please note that if you do this, then want to call that person on another number, you’ll need to go into the People app and find the number you wish to call. When manually dialling a number, tap the keypad icon and type the number into your phone. You must complete the process by tapping the
phone icon at the centre-bottom of the screen.