This feature can be used to send the same SMS content to a list of mobile numbers. All you need is the correct Mobile numbers of the Receivers.
Navigation: Salesforce > Open Tab “ Bulk Messaging”
Select the Sender ID from the “Select Sender ID” dropdown.
Phone Numbers separator: in this section, you have to select Comma, Space, or Newline to enter phone numbers in the Phone Number box.
Add required text in the “Message Body”. The body text is limited to 1600 characters unless you select “Non-object Templates”.
Note: “non-object templates” means without merge fields.
Click on “Send SMS” to deliver the message.
You can send messages even without adding/attaching a contact record.
You can view the status of each message in the Message bucket Object.