CallKit lets you receive and answer Snapchat calls without first unlocking your device or opening the app! CallKit is a feature that’s built into Snapchat.
Snapchatters on iOS can also call friends back from their device's call log 📲
Calls made through CallKit don’t show up on your phone bill 👻
To prevent calls from non-Friends, you will need to update your Privacy Settings options for 'Who Can Contact Me' and 'Send Me Notifications.'
Please Note: CallKit can’t be disabled, but you can delete entries from your iOS call log.