Step 1: To change your mobile number, go to "Me" Tab > "Buying" Tab > My Account > My Profile > Phone > Edit.
Step 2: Enter your password for verification.
Step 3: Follow the onscreen instructions to change your phone number. For security purposes, you may be required to provide additional account information for verification.
Step 4: After you have successfully verified your account, you can now key in your new mobile number. A verification code will be sent to your new phone number.
Step 5: Enter the verification code and tap on “Continue” to complete the process. Your mobile number should be changed successfully.
If you're still having a problem changing your number, click here to learn more.