You can automate the sending of TXT messages with Process Builder.
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TXTinIT comes standard with Apex Class Actions that can be used in Process Builder
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This example will show you how to create an automation that sends an SMS to alert customers when their case has been closed.
Add texting to a Process Builder

Step 1: Go to Setup
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Click the Gear Icon in the top right of the screen.
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Click on Setup.

Step 2: Open Process Builder
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Type "Process Builder" in the Setup Quick Find Box.
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Create a New to begin building a new process
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Step 3: Name your process and define the Trigger type
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Give your process a name
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Give your process a description
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Choose when your process should start. In our example, we chose "When a record changes"
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Click Save

Step 4: Choose Object and Specify When to Start the Process
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Click "Add Object"
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Select the Object, in our example, we want to trigger the process when a Case is closed, so we chose Case
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Choose whether the process should run only when records are Created, or when a record is Created or Edited. We chose "When a record is created or edited".
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Click Save

Step 5: Define Criteria for this Action Group
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Click on the first node.
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Select your criteria for executing actions. We chose "Conditions are met".
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Set your conditions for when actions should execute.
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Click Save
Here's how we defined or conditions
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[Case].Status, Equals, Picklist, Closed
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[Case].ContactId, is null, Boolean, False
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[Case].ContactMobile, does not equal, Global Constant, $GlobalConstant.EmptyString
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[Case].Status, is changed, Boolean, True
Step 6: Switch Back to Lightning Experience
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Once you have completed your Bulk Send, click on Switch to Lightning Experience.

Step 4: Select and Define Action
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Click "Add Action" in Immediate Actions Box
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In Action Type, Select "Apex"​
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in the next field, start typing "Send SMS", then select the Send SMS Apex Class.
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Set the Apex Variables.
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Click Save
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Here's how we set our variables
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Target Record Id, Field Reference, [Case].Id
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To Number, Field Reference, [Case].Contact.Mobile.Phone
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SMS Message, Formula, "Hi " + [Case].Contact.FirstName + ", your case " + [Case].CaseNumber + " is now closed."

Step 5: Activate your Process
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Click "Activate" in the top right corner