Over the past couple of weeks on the official support forum Apple has gathered a lot of complaints about bugs in iOS 13.1.2. Users complained of high energy consumption, problems with calls, etc. In the end, the cupertinos have prepared the next service update — iOS 13.1.3 – that became available tonight.
In a nutshell, the update is aimed solely at correcting the various bugs and shortcomings that surfaced in the last release. So 13.1.3 iOS fixes a bug where iPhone not to vibrate or not to make a sound during an incoming call, and solves a number of problems with notifications and some standard applications.
However, judging by the reviews, in iOS 13.1.3 was not solved all the problems. Now users continue to complain of instability of cellular and LTE. Also some have reported low autonomy.