SMS reverse billing 

SMS reverse billing is a form of ‘micro billing’ based around SMS text messaging. It allows small transactions to be conveniently made by sending an SMS text message from a specific short code. This form of billing is called 'mobile terminated billing' or MT and results in a charge appearing on the recipient’s next mobile bill for line rental customers or a charge , with the fee being charged by the network operator to their customer. The operator of the short code will then receive a proportion of the amount which has been charged for the message by the network operator. 
 
Applications for reverse billing 

SMS reverse billing has traditionally been used as a convenient way to pay for information services and competition entries. Reverse billing is now becoming a viable alternative to credit cards when dealing with low value transactions allowing for automated payment systems which can be integrated into a website or be operated in a completely remote location. As charges are made based on the messages received (mobile terminated messages) this process can be initiated by the end user texting a keyword on the short code, which then responds with an MT message resulting in the charge at the agreed rate.