How to update iOS on my iPhone
Update ios
[Re-Titled by Moderator]
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Which iPhone do you have ? If its older model maybe there is no iOS update, if its newer, than do this:
Go to SETTINGS > GENERAL > SOFTWARE UPDATE and wait for iPhone to check for it.
Than if there is new update click on UPDATE and enter your passcode to confirm.
iPhone will download it and install for you, but first put it on charger before you do this.