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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
How can I update my phone version
The iPhone 5s/6./6Plus cannot upgrade further than iOS 12.5.5 due to hardware limitations
If you have an iPhone 6s or above see this instrcuctions on how to upgrade to iOS 15.5
How to update to iOS 15 or iPadOS 15 - Official Apple Support
Can I do it my self
I want to update my phone version
