iOS 13

An iPhone 6 can't be updated beyond 12.5.5, it doesn't have the hardware needed to run a higher iOS.

If you need a higher iOS version, you will have to purchase a newer phone.

iOS 13 is not available anymore for newer phones, for iPhone 6S and above, 15.4.1 is the current operating system that is available.

ary48 Said:

"iOS 13: Hello everyone, I need to install app that required iOS 13, I’m using iPhone 6, which Not available for IOS 13, what should I do , any advise ?"

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For Reference...

Updating an iPhone:

What to Update:

Update Installed Apps along with the iOS.

Determining if an iOS Update will Install:

How to do so...

I. Verify Compatibility:

Identify your iPhone model. The first thing that comes to mind in incompatibility being the culprit. So, confirm the model of your iPhone. If iPhone model is incompatible with iOS15 then it is because you iPhone does not meet the hardware requirements for this iOS version(s).

II. If Compatible...

1. Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

then...

2. Proceed with the Update:

Use my User Tip:  Update your iPhone Using a Computer - User Tip

Your choices are to either get a new iPhone that is capable of running iOS 13 or don't install the app. There is no in-between solution.

ary48 Said:

"Thank you all for your replies. Much appreciated"

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You are welcome.