Companies that use a single text messages deliver a one-time text message with no intent to send it again. A single-message SMS program’s purpose is to communicate only once, with no desire to collect phone numbers for future text messages. 

You can send single SMS to any user, by using Sender ID or Dynamic Sender ID. When you send a one-way SMS, you either can use a custom Sender ID. SMS can be sent by using Mobile SMS Gateway App.