I cant get any update in my phone

Go to Settings > General > About > Version. If it shows iOS 12.5.5 you have updated as far as you can go, the 6 Plus does not have sufficient RAM to run iOS 13 or later and you cannot add RAM. If you want to run a higher version you will need a newer iPhone, I suggest at least an iPhone 8 as the 6s and 7 series will not run the upcoming iOS 16.

ankuhs Said:

"I cant get any update in my phone: I cant download some apps cos of no update coming in my phone"

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For reference...

Updating an iPhone:

What to Update: Installed apps and the iOS.

How to do so...

A. 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).

B. 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