SMS messages are a great way to contact hosts and visitors within Sine.

When a visitor arrives on site and selects their host, a notification can be sent via SMS, email and/or push notification to the Sine Pro mobile app. These notifications are included on all plans at no additional cost.

Bulk SMS is not supported by Sine. If a bulk group of users needs to be contacted, this can be achieved using email or push notifications.

See more here

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