What are all the difference between iOS3, iOS4 and iOS5?



What are all the difference between iOS3, iOS4 and iOS5?..

Answer / Navjot Singh

{"iOS3": "* Version released in 2009n* Supported older devices like iPhone 2G, iPod touch 1G and iPhone 3G.n* Used HFS+ file system.n*, Didn't support multitasking.",
"iOS4": "* Version released in 2010n* Introduced multitasking feature for compatible devices.n* Supported Game Center, iAd and AirPrint.n* Used HFS+ file system.",
"iOS5": "* Version released in 2011n* Dropped support for older devices like iPhone 3G and iPod touch 2G.n* Introduced new features like Notification Center, Newsstand, Twitter integration, iCloud, etc.n* Switched from HFS+ to APFS file system.",
"reference": "https://www.apple.com/ios/history/

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