You may follow the below steps to register / update your mobile number to receive the SMS from UM,

1. Login to SIAPP through myUM Portal (

2. Select “Student Profile” on the left menu
3. Select “Other Info.” and click “Change SMS Mobile Number

4. Enter your mobile number
5. Re-enter your mobile number and click “Send Verification Code
6. A verification code will be sent to your mobile via SMS
7. Input the verification code and click “Save