What is the current ios update for iphone?
No context provided
What is the current ios update for iphone, released in 2017?
10.3.3
No context provided
What is the current ios update for iphone, released in 2016?
9.3.5
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What is the current ios update for iphone, released in June 2014?
7.1.2
iOS version history
https://en.wikipedia.org/wiki/iOS%20version%20history
The version history of the mobile operating system iOS, developed by Apple Inc., began with the release of iPhone OS for the original iPhone on June 29, 2007. Since its initial release, it has been used as the operating system for iPhone, iPad, iPod Touch, and HomePod, seeing continuous development since then, resulting in new major releases of the software typically being announced at the annual Apple Worldwide Developers Conference and later released in September, coinciding with the release of new iPhone models. 
IOS version history
The version history of the mobile operating system iOS, developed by Apple Inc., began with the release of iPhone OS for the original iPhone on June 29, 2007 and since its initial release, it has been used as the operating system for iPhone, iPad, iPod Touch, and HomePod, seeing continuous development since then, resulting in new major releases of the software. In 2014, the iOS update for the iPhone was 7.1.2. In 2016, the iOS update for the iPhone was 9.3.5. In 2017, the iOS update for the iPhone was 10.3.3.