I forgot my iPhone password what must I do

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If you forgot the Apple ID (iCloud) 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  *      

Hello~ Take a look here:

If you forgot your iPhone passcode - Apple Support

Or…

How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

~Katana-San~