One-way SMS is used when a messaging application needs only one-side communication with the user. This means that in one-way SMS neither a short code nor a long number is required.
The number from where the message comes or the originator of the message or sender can be set to an alphanumeric string, e.g. with a brand name, but it is determined by the rules and regulations in a specific country. The user cannot reply to one-way messages.