Can i update my iPhone 7 Plus?

Are you thinking about iOS 16, by any chance?

Should be this case, after summer your iPhone won't be able to run that new major update, sorry.

These are the iOS 16 compatible iPhone models:

If you mean something different, please post back with relevant details and specify your needs better.

Thanks and regards

Giulio

have you read thru this support article for updating?

Update your iPhone, iPad, or iPod touch - Apple Support

need more storage for update?

If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support

issues?

Updating iOS: common issues and solutions - Apple Community

video..

What happens when you try?

What iOS version is currently running on it?

You are welcome.