Updating the iphone
Note: Apple's updater is likely to suggest additional software that you can download (such as the Safari browser); none of this is necessary.
In order to fully patch the security bug and no longer be vulnerable, every i Phone user you message with has to have also updated to i OS 9.3.
You can also check your Settings app to see if there’s a small red alert badge, telling you it’s time to update.
Even if you don't see the alert, you can manually force your device to update.
i OS 10 launched on 13 September 2016, bringing with it a number of new additions and refinements; since then Apple has launched a series of smaller upgrades with patches and minor new features.
All have been made available to i Pad & i Phone users for free (assuming your device is a recent enough model to qualify).
Most of us are familiar with the window that pops up on our i Phone screen every so often telling us that there's a new version of the i OS available for download.