Apple has released an iOS update that fixes the problem with the iPhone reset when it receives a specific Telugu symbol in instant messengers. Update 11.2.6 contains a change that solves this problem.
Earlier it was reported that Apple removed the bug in iOS 11.3, but this update is still in beta testing and will appear in the fall. It seems that the company decided to release a minor update after the error became widely known.
Also, update 11.2.6 fixes an error that caused some programs to not connect to external accessories.
Together with this update, we got macOS, tvOS and watchOS.