Supported Devices:

iPhone:
iPhone 4S
iPhone 5
iPhone 5C
iPhone 5S
iPhone 6 & 6 Plus
iPhone 6S & 6S Plus
iPhone SE 1st Generation

iPod  Touch:
iPod Touch 5th Generation
iPod Touch 6th Generation

iPad:
iPad 2
iPad 3
iPad 4

iPad Mini:
iPad Mini 1st Generation
iPad Mini 2
iPad Mini 3
iPad Mini 4

iPad Air:
iPad Air 1st Generation
iPad Air 2

iPad Pro:
iPad Pro 1st Generation

Initial Release: 9.0 (September 16 2015)
Latest Release: 9.3.6 (July 22 2019)

New Features:
- Hands off Siri
- Apple Pencil support
- Replace Newstand with News App
- Last iOS Version with Slide to Unlock
- Live Photos (iPhone 6S and 6S Plus only)
- Replace Passbook with Wallet App
- iCloud verification codes
- Multi-factor authentication for Apple ID
- Low Power Mode
- 3D Touch Support
- New Wallet App