my iphone is locked and dont know the password to unlock it?

If you mean the lock screen passcode, follow the instructions here: If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled

If you mean you don't know the Apple ID password, you will have to recover access to your account. Start here: https://iforgot.apple.com

If it is locked with someone else's account, the owner of the account is the only one who can remove the activation lock.

Are you the original buyer or did you purchase a used phone? If your phone is used, ONLY the owner who set up the phone can unlock the phone.

What is your situation here?