Hi Jakkkazzz,
Thanks for posting in Apple Support Communities.
Let's see how we can help get you signed in on your new iPhone. Are you signed in using your Apple ID on any other device? If so, the article below will help you out on how to get the verification code.
Once you have the code and signed in to your account you can update the phone number. While in your account be sure you have the additional settings updated so should you get locked out of your account, you have alternate ways to regain access. See the link below for details on managing your account.
Let us know if you have any questions.
Take care!