Just go into Settings > Privacy & Security > Location Services > Location Sharing, and you'll be able to see a list of people who have access.
Go to Settings > Privacy & Security > Location Services and then scroll down to see a list of apps that have access to your location.
Just go into Settings > Privacy & Security > App Privacy Report and then turn it on.
On both iPhone and Android, you can go into settings and control which apps have access to sensors and info.
If a dodgy app gets access to your photos, it could grab up pictures of important letters and documents, snaps of your passport or driving licence, and other info that can be used to defraud you.
