iOS 13.1.3 includes bug fixes and improvements for your iPhone. This update:
Addresses an issue that could prevent a device from ringing or vibrating for an incoming call
Fixes an issue that may prevent opening a meeting invite in Mail
Resolves an issue where data in the Health app may not display correctly after daylight savings time adjusts
Fixes an issue where Voice Memos recordings may not download after restoring from iCloud Backup
Addresses an issue where apps might fail to download when restoring from iCloud Backup
Fixes an issue that can prevent Apple Watch from pairing successfully
Resolves an issue where notifications may not be received on Apple Watch
Fixes an issue where Bluetooth may disconnect on certain vehicles
Improves connection reliability of Bluetooth hearing aids and headsets
Addresses launch performance for apps that use Game Center
For information on the security content of Apple software updates, please visit this website:
https://support.apple.com/kb/HT201222