iOS 15.1.1 is supposed to eliminate call bugs on iPhone 12 and 13

Apple has released the update to iOS 15.1.1 for its iPhones. It is a maintenance update that is supposed to fix user-reported calling issues for the iPhone 12 and iPhone 13. Some users complain about dropped calls on these models. According to the update note, the new version of iOS "improves dropped call performance on iPhone 12 and iPhone 13 models." (via)