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You can request account recovery (get Apple’s own instructions in a later section in this article: https://support.apple.com/102656#:~:text=If%20you%20can%27t%20reset%20your%20password%2C%20request%20account%20recovery ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity. One tip to using account recovery is to look for options in small blue letters beneath the normal log-in items if you cannot complete the requested information.

Also read this article about what to expect during account recovery —> https://support.apple.com/118574

Here are links to posts by Community contributors which provide additional detail about the account recovery process and what to do if you do not receive a text or call: https://discussions.apple.com/thread/255401538?answerId=260044580022 and https://discussions.apple.com/thread/255909322?answerId=261058302022 and https://discussions.apple.com/thread/256188713?answerId=261688110022. This thread outlines the multi-step process and final recovery —> https://discussions.apple.com/thread/255733423 , and this one about things you should and should not do while waiting —> https://discussions.apple.com/thread/256148234?answerId=261595361022 This is a very long user contributed document about account recovery —> https://discussions.apple.com/docs/DOC-250009681

If you cannot recover the account, you may at least be able to regain use of the hardware again for use with a new account. Refer to https://support.apple.com/108934 for the various ways to remove an Activation Lock. If you have the necessary information you can do this yourself, otherwise Apple can completely reset a device if a person can provide sufficient evidence of valid ownership. Check the requirements and steps at: Activation Lock support request - https://al-support.apple.com/#/additional-support Apple says, "Proof of ownership documentation is required," but does not detail what currently constitutes proof other than it “must include the product serial number, IMEI or MEID.” Apple may typically require the original receipt* issued by Apple or an Apple Authorized Reseller. If Apple resets the device this will give you access to the device but won't restore access to the account used to lock it. There is nothing that can be done to expedite an Activation Lock request.

*Apple recommends you "Keep your receipt after you buy an Apple device" --> https://support.apple.com/HT202711

If you cannot remember or find your username/email and cannot get a verification code sent to your old phone number:

1. Go to Apple iForgot and enter your Apple Account username (or try your old phone number/email). 
2. When prompted for a verification code you cannot receive, look for an option like "Didn't get a code?"or choose that you don't have access to the trusted phone number. 
3. Follow the on-screen prompts to start Account Recovery. You may be asked to verify other details or receive a code via an alternative email. 
4. Wait for the recovery period: Account recovery is an automated safety process. It typically involves a review/evaluation phase (24 to 72 hours) followed by a waiting period that can take several days or longer.