Two Step Verification
How can i log into my old apple id account if i forgot my phone number i used for two step verification and i don’t have access to it?
iPhone 6s, iOS 15
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With the older 2 step verification system, the only backup when you cannot get a 4 digit code via SMS text is to use your recovery key which was generated when you first set up 2 step verification. It would be a 14 character alphanumeric code.
Without the SMS number or without the backup code, you will not be able to regain access to an account secured with 2 step verification.
See -> Two-step verification for Apple ID - Apple Support
”What do I need to remember when I use two-step verification?
Two-step verification simplifies and strengthens the security of your Apple ID. After you turn it on, there's no way for anyone to access and manage your account other than by using your password, verification codes sent to your trusted devices or SMS-capable phone number, or your Recovery Key. Only you can reset your password, manage your trusted devices, or create a new Recovery Key. Apple Support can help you with other aspects of your service, but they aren't able to update or recover these three things for you. When you use two-step verification, you are responsible for:
- Remembering your password
- Keeping your trusted devices physically secure
- Keeping your Recovery Key in a safe place
If you lose access to two of these three items at the same time, you could be locked out of your Apple ID permanently.”