Question marked as
Top-ranking reply
User profile for user:
alma1090
User level:
Community Specialist
Hello and welcome to Apple Support Communities, bongvan!
We understand you need to change the recovery phone number for your Apple ID. We'd be happy to provide information to help you out.
Try the steps suggested here: Two-factor authentication for Apple ID
"What if I can't access a trusted device or didn't receive a verification code?
If you're signing in and don’t have a trusted device handy that can display verification codes, you can have a code sent to your trusted phone number via text message or an automated phone call instead. Click Didn't Get a Code on the sign in screen and choose to send a code to your trusted phone number. You can also get a code directly from Settings on a trusted device. Learn how to get a verification code.
If you use iOS 11.3 or later on your iPhone, you might not need to enter a verification code. In some cases, your trusted phone number can be automatically verified in the background on your iPhone. It’s one less thing to do, and your account is still protected with two-factor authentication."
Have a great day!