How to Remove Apple ID from iPhone without Password

[mind5]

I bought a new iPhone and create a new Apple ID, now I want to sell the old one and need to sign out of the previous Apple account. But, I don't remember the password.  ? Does someone know? 

[Syaoran]

You will have to reset the password for the Apple ID and make sure you remove that device from that Apple account.  Then factory reset the iPhone.  

[FuzzyLogic · Accepted solution]

Here you go:

If you forgot your Apple ID password - Apple Support (CA)