For anyone with an iPhone 6 or later, the update's Apple Pay Cash feature opens up the ability to send cash to friends and family over iMessage. While I didn't see the feature immediately turned on after updating my own iPhone to iOS 11.2, when it does appear it should work similarly to Paypal's Venmo service.
 
	 
 
	 
 
	Other improvements and fixes listed by Apple include:
 
		Improves video camera stabilization
	
		Adds support in Podcasts to automatically advance to the next episode from the same show
	
		Adds support in HealthKit for downhill snow sports distance as a data type
	
		Fixes an issue that could cause Mail to appear to be checking for new messages even when a download is complete
	
		Fixes an issue that could cause cleared Mail notifications from Exchange accounts to reappear
	
		Improves stability in Calendar
	
		Resolves an issue where Settings could open to a blank screen
	
		Fixes an issue that could prevent swiping to Today View or Camera from the Lock Screen
	
		Addresses an issue that could prevent Music controls from displaying on the Lock Screen
	
		Fixes an issue that could cause app icons to be arranged incorrectly on the Home Screen
	
		Addresses an issue that could prevent users from deleting recent photos when iCloud storage is exceeded
	
		Addresses an issue where Find My iPhone sometimes wouldn't display a map
	
		Fixes an issue in Messages where the keyboard could overlap the most recent message
	
		Fixes an issue in Calculator where typing numbers rapidly could lead to incorrect results
	
		Addressed an issue where the keyboard could respond slowly
	
		Adds support for real-time text (RTT) phone calls for the deaf and hard of hearing
	
		Improves VoiceOver stability in Messages, Settings, App Store and Music
	
		Resolves an issue that prevented VoiceOver from announcing incoming Notifications