ATM screen flow for registration/change of mobile phone number is as per follows:

1. Insert ATM Card or Credit Card at any AmBank ATMs. Enter your PIN for verification. Select "PIN CHANGE/AmOnline SERVICES" from the menu.
   
    
2. Select "REGISTER/CHANGE TAC MOBILE".
   
    
3. Enter mobile number e.g. 012XXXXXXX then select "PRESS IF CORRECT".
   
    
4. Confirmation transaction screen will be displayed. Take the receipt for reference.