I what to update my iPhone

To update to the maximum of iOS 12.5.7, please see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

Hello ~ You will only be able to update to 12.5.7 and not higher. If you require a higher version of iOS you will need a newer iPhone preferably an iPhone 8 or higher. If you choose to purchase a second hand device…which is fine by the way…please take a moment to click on and review these helpful links in order to make an informed purchase…

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Also:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

To update see here>>> Update your iPhone or iPad - Apple Support

If you can’t update see here>>> If your iPhone or iPad won't update - Apple Support

~Katana-San~

Your iPhone is too old and would not be compatible with the newer software updates.

Click ▶︎ iPhone compatibility with iOS 13 for the complete list.

The time has come:

Shop one-on-one with a Specialist at an Apple Store.

Click ▶︎ Reserve a Shopping Session. 🛒

noumon Said:

"I what to update my iPhone"

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Updating an iPhone:

Update Using a Computer:

You can use a Computer to update. Read My User Tip: Making Use of a Computer for Updating an iOS Device - User Tip. If any updates are available, they will install, sure enough.