How can the system avoid duplicate sending SMS?

When sending (adding) SMS, you can tick "Filter customers with the same mobile number" to filter phone numbers and avoid duplicate sending.

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https://support.vitalyun.com/en/?catid=28&id=4876%3Ahow-can-the-system-avoid-duplicate-sending-sms&view=article

When sending (adding) SMS, you can tick "Filter customers with the same mobile number" to filter phone numbers and avoid duplicate sending.