A:  RCM allows you to send SMS messages directly from the system to a customer's mobile phone. When sending an SMS, the system defaults to the mobile phone number entered in the Reservation. The mobile number can also be overridden and entered manually if required. If a mobile phone number has not been entered, you will not be able to send an SMS message. 

Using the feature will require registration and pre-paid credits to be purchased - this will be self explanatory with the links to the SMS suppliers admin area available on the screen. The fees are less expensive than normal text messages.