A system and method to append an advertisement to a Short Messaging Service (SMS) message. The system, which is implemented in a communication network with an SMS, includes two units, a first unit to identify a message recipient's subscription status to determine whether the recipient is subscribed to receive advertisement based SMS, and a second unit that appends an advertisement to the identified message before delivery to the message's recipient. First, the first unit identifies whether the intended recipient of an SMS message is subscribed to receive advertisement based SMS. Second, the first unit routes a request to the second unit to insert an advertisement into the identified SMS message. Third, the second unit appends an advertisement to the SMS message. Lastly, the second unit routes the modified message to the SMS in the network for delivery to the recipient's device.