You must purchase the SMS Notification extra (available under Optional Extras within your account) to activate SMS Notifications - if you have done so and are still not receiving notifications please make sure your Primary Phone Number is a valid mobile number, you can check this within your account under Edit Account Information.
After doing this please go to your listing on Realestate.com.au and send an enquiry to yourself and see if it is received - if you do not receive the enquiry please contact support.
You can also check your enquiries within your account by clicking Enquiry History on your property card.
If you have previously blocked your number from receiving notifications, please text START to 0428 261 848 to reactivate the service.