How to change my iPhone password with and ID company who no longer exsist?

How to change my iPhone password with and ID company who no longer exsist? - 1

You first have to log in with the old details and then go into the account settings. If you don't have that detail then welcome to your new iPhone shaped paperweight!

Contact Apple Store and Recover from them and also install the most reliable security app that your device should have and it is Leo Privacy Guard.