I don't have the phone number anymore where they sent my access code

If you are unable to remember your password, security questions, don’t have access to your rescue address or are unable to reset your password for whatever reason, your only option is to contact Apple ID Support, upon speaking to an operator you should explain that your problem is related to your Apple ID, this way you will not be charged for assistance, even if you don’t have an AppleCare plan.

You will need to show patience with the procedure and be prepared to demonstrate without question that the account belongs to you. Don’t expect access to be restored immediately and if you aren’t the owner of the Apple ID registered to the device the account won’t be reset.

On your iPhone, go to Settings → iCloud → Keychain and switch Keychain off then on again.

Tap "Approve with Security Code", tap "Forgot Code" and then tap "Reset".

Follow the instructions to reset iCloud keychain and create a new passcode.

You will then be prompted to update to your new number.

Learned from Zinacef