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Users who aren't available to video call one another are now able to voice call instead for free using Apple's own messaging system, piggybacking off the idea of BlackBerry Messenger and Facebook Messaging.
Siri 2.0: Aesthetic overhaul, improvements
The voice-activated intelligent assistant has a brand new, cleaner and fresher look. Siri now supports a whole variety of new features, functionality, questions and queries that vastly broadens its range of intellect (...but only with an cellular or Internet connection.)
Filters à la Instagram now feature as part of the iPhone's camera software. Hot on the tails of the popular photo snapping and sharing service, iOS 7 now includes nine different temperature-based filters that modify images to suit the mood. As of later betas of the next-generation mobile software, camera filters are now available for the iPhone 4S.