reset iphone passcode without computer

As you’ve apparently forgotten your passcode - and appear to be running iOS 16 - you can possibly reset your phone w/o a computer by this method:

If you see an iPhone or iPad unavailable message or Security Lockout screen – Apple Support (AU)

If that dosen’t work, you’ll indeed need a computer (and a cable) to perform the follow-on procedure linked near the end of the article.

See if this helps: If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

You generalky do NOT need 2FA to “turn on” and use your computer. (although you usually WILL need a password)

Can you give some more specifics about what you’re attempting to do ?