Your phone contains your photos, your calendar, your contacts, a record of where you've been and who you've spoken to, your emails, your social media, the notes and reminders you write to yourself, your health and fitness data, shopping lists and period apps - our phones reveal who we are.

You might think you own your phone - but there is data on your phone that you can't access, you can't delete and possibly is being silently leaked to companies you've never heard of