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iPhone OS 1 is the first major release of iOS.OS. This version of iOS was the first repetition of Apple's touch-centric mobile operating system. No official name given on its initial release.
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It allowed users to purchase music directly on their phones, As the name implies, the store only worked over Wi-Fi.
Features
iTunes Wi-Fi Music Store, iPod Touch compatiblity -
Features
Google street view, Podcast downloads -
Features
Better location, Web clips on home screen, Re-arrange icons, Multi touch keyboard -
iPhone OS 2 is the second major release of iOS. It was the first release of iOS to support third-party applications via the App Store. iPhone OS 2.2.1 was the final version of iPhone OS 2. The most noticed feature of iPhone OS 2 was the App Store. Before this feature was introduced, the only way to install custom applications on the device was via jailbreaking.
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Features
Battery life and speed fixes, iTunes Genius playlist, Dropped calls fixed. -
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Cut, copy and paste, Spotlight search, Push notifications for 3rd party apps, Voice control, MMS, USB and Bluetooth tethering, landscape keyboard and Find my phone
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Genius features, Ringtone downloads, remote lock, voice control over Bluetooth
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New UI paradigms for a larger screen, New app designs, The note book (The Notepad app received a border of stitched leather to make it look like a real notebook, the Calendar and Contacts apps were both made to look like small books, complete with pages.), iBooks
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Multitasking, Home screen folders, FaceTime video chat, Unified email inbox, Threaded email messages, Retina display support, iAd support
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Game Center, TV rentals, iTunes ping, HDR photos
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iPad multitasking,, iPad folders, Airplay, Airprint
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Verizon support, Personal hotspot (CDMA only)
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Personal hotspot (GSM), Airplay for 3rd-party apps, iTunes home sharing
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Siri, Notification center, PC-free, iTunes Wi-Fi sync, iMessage, iCould
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Homegrown Maps and turn-by-turn navigation, Siri enhancements, facebook integration, passbook, iCould tabs, Mail enhancements, facetime over cellular
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Visual overhaul, control center, Airdrop, Refreshed core apps, iTunes radios, Facetimme audio, Touch ID
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Continuity, Widgets, Extensibility, QuickType, iCould drive, Healthkit, Homekit, Family sharing
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