Yes, your customer will be reminded via SMS.
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If your customer is using a mobile number, they will be reminded 5 minutes before the scheduled call via an SMS.
Can the SMS be customized?
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Yes the SMS can be customized Settings > Platform > Auto-Response
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Click on auto-response as shown on the below picture to enable.

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Set your Sender ID, if not already set, for your customer to easily identify your business or brand.
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Scroll to Call Reminder (Customer)
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Insert your Auto Response massage
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You can also set auto reminders for agents as shown below.
