Windows Phone does a good job automatically piecing everything together, though sometimes it misses adding your phonebook contact with their Facebook profile.

How to add contacts in WhatsApp for Windows 10 Mobile Launch WhatsApp from the Start screen or from All apps. Swipe left until you get to the to the all screen.

Getting to grips with Windows 8? Here's how to get the People and Photos apps grabbing your friends' pics and info from all your services.