HT201412 i have a iphone 3 what is the latest update my phone will support ? and how do i do it there is no update button in my settings

i have iphonme 3 how do i update iOS and what is the latest verison i can use?

The highest version of iOS that can be run on an iPhone 3G is 4.2.1.
A 3GS can run 6.1.3.
The option to update over the air only appears if you are running iOS 5 or higher.

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