You can send the text message (SMS) to a particular mobile number using this Application. 

For sending SMS, you need to configure the target mobile number (where the SMS is to be sent) with the salesforce org (where you can log in). 

 You have a facility to configure the target mobile number with either Lead, Contact, or Opportunity e.g  Lead. Once the configuration is done, you need to open the respective object (Lead, Contact, or Opportunity) and use the Send SMS feature available on the right side of the page as shown.

Type a message and click on the Send button.

A success message will be displayed each time the message is delivered.