How do I unlock my phone if I have forgotten my password

If you forgot the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification  email option if necessary. Link to contact Apple Support at the end of the 2nd article.

Apple ID - Manage            

Apple ID – Forgot Password            

If you forgot the passcode, see the Apple Support article(s) below.

Passcode - If you forgot the passcode for your iPhone or your device is disabled.