It's a good practice to link your Grab account to either Google or Facebook. This way, you can always have access to your Grab account even if you've changed to a new mobile number.
1. Access the menu () and tap on your name.
2. Choose to link your account to Google or Facebook.
3. You will be re-directed to Google or Facebook login page. Authorise the link when prompted by Google or Facebook.
You can un-link anytime by tapping Unlink from Facebook or Unlink from Google.
Tap UNLINK to proceed.