If you're outside the UK and concerned about who can see your data, here's how to turn ADP on and how it differs from the default iCloud encryption.

When cellular service is available, your iPhone uses it for emergency calls. If you turn on Wi-Fi Calling and cellular service isn't available, emergency calls might use Wi-Fi calling.

Apple's highest level of iCloud encryption, Advanced Data Protection for iCloud, secures your data so it's unreadable even on iCloud servers.