To send a bulk message, you will need to add the Send Batch SMS button to your List View search layouts.​
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The package will require you to use the Bulk Message feature in Salesforce Classic.
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This example will show you how to add the Send Batch SMS button to the Contact object.
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Sending a Bulk Message

Step 1: If you are using Lightning Experience, Switch to Salesforce Classic
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Click on your Avatar.
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Click on Switch to Salesforce Classic.

Step 2: Search Setup for Search Layouts
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Open the Setup Menu.
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Type "Search Layouts" in the Setup Quick Find Box.
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We chose the Contacts object in this example.
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Click on Search Layouts for your desired object.
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Step 3: Edit the List View Search Layout
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Click edit on the Contacts List View.

Step 4: Add batch send to Search Layouts
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Select the Batch Send SMS button under Custom Buttons.
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Click the arrow to add Batch Send SMS Button to the List View Search layout.
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Save your search layout.
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Remember that it can take a few minutes before the button shows up on your Search Layout. Try hard refreshing (CTRL+F5) if it doesn't show up.

Step 5: Confirm Button Placement
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Go back to the Contacts and confirm that the Batch Send SMS button appears in your Search Layout.

Step 6: Switch Back to Lightning Experience
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Once you have completed your Bulk Send, click on Switch to Lightning Experience.