You can change the mobile number associated with your account in your Personal Pages, mobile app, or mobile web. The instructions for changing your mobile number within your Personal Pages are shown below, but note that changing your mobile number within the mobile apps varies by app (iPhone, Android, Windows, Blackberry, or mobile web). In most cases though, visit the Settings within the app and choose Profile Settings.
Using the Personal Pages:
1. Sign in to your Personal Pages
2. From the left navigation list, click My account. The Account Details page appears.
3. Click Edit user details.
4. In the Mobile Number field, enter your new 10- digit phone number without dashes or spaces, and then click Save.