I forgot my iPhone passcode

You will have to reset the passcode to your iPhone. This process requires that all data be erased first. There is no way around this. If you do not have a backup created on a computer or on iCloud, then you will permanently lose the data that is on the iPhone.

Axel F.

Think hard and try to remember the passcode before you run out of tries. Yes, you can reset/erase the phone and set up a new passcode.

But....with no backup, you have nothing to restore back to the phone, and must start all over again from scratch, manually downloading apps, setting up email, etc. Messages, photos, etc are gone.