i need more space in my iphone. How can i get more?

Start here:--> If you need more space for an update - Apple Support

and/or here:--> What's the difference between device storage and iCloud storage? - Apple Support

Regards

Giulio

You will have to delete something to get more space on your phone.

There is no way to add more storage space to a phone. You will need to transfer data to your computer or some other online storage site.