Why i can't upgrade to iOS 16?

Hello dimple20,

Thank you for reaching out to Apple Support Communities.

This may be able to guide you with updating:

If you can’t install iOS 16 or iPadOS 16.1 on your iPhone or iPad

You might be unable to update your iPhone or iPad wirelessly — or over the air — for one of these reasons:

Your device doesn't support the latest software

There isn't enough available storage space on your device

The update takes a long time to download

Your device isn't able to reach the update server

The update doesn't complete

More details can be found here: If your iPhone or iPad won't update

If you are still having issues, can you provide a few more details? How are you updating? Are you seeing any error messages? Also, what is your current iOS version?

Cheers!