Reverse SMS billing or premium SMS service means that the user of the recipient phone rather than the message sender is charged for the cost of the SMS message received. It is also called MT (Mobile Terminated) Billing. Reverse-billed SMS messages should only sent if specifically requested by the phone user, however many unscrupulous operators will send reverse charged messages without prior consent of the recipient, which often go un-noticed by users on Pay As You Go plans without itemised billing. A daily weather alert is an example of a service where regular reverse-billed messages are received.
In some countries, providers are required by law or regulation to provide a means of opting out of a service once it has been commenced. Most typically, this is achieved by sending a stop message (most typically, simply STOP) to the same number as the service itself.
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