Whether you remember to call them, or they passive-aggressively call you, iOS 27 will make sure you know it's their birthday. New in iOS 27 is a birthday reminder that means if you are on a call with someone, your iPhone will tell you if it's their special day with fireworks! There may not be a smaller addition to iOS 27, but the Phone app's birthday reminder is a really nice touch. In the current betas, if you call someone, the Phone app checks the contact card you've got for them. True, you could argue that you actually need a birthday reminder a little ahead of the day, in order to buy that gift.