There are three ways to send Batch Text Message aka Bulk SMS, Batch SMS with 360 SMS. This also applies to Batch MMS (sending of pictures):
1. List Views – the Send SMS button is placed on ListViews or Related Lists
2. SMS from Reports – this is a unique feature only available from 360 SMS whereby you use standard Salesforce Reports to execute the batch SMS. This is the most robust method as SF Reports allow cross object queries and unlimited rows.
3. Campaign – Add the Send SMS button to the Campaign Page Layout and all Campaign Members can be sent a Template of your choosing.