I want to reactivate an old iPhone but I can’t remember what my password was

If your iPhone has iOS 15.2 or later installed, check out this link→How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support. Otherwise:

See this Apple support link→If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

Or watch this companion video ⬇️

After restoring the phone using one of the methods above you can restore your most recent backup.

▷ Forgotten iPhone login passcode. 

I have an old iphone that I would like to sell, but I forgot the password. How do I get a new one