With 90-99% open rates and 50-75% click-through rates on average, transactional SMS is quickly becoming one of the biggest areas of opportunity in the post purchase journey.

Maximizing on this demand for transactional SMS by using automated SMS flows (which are responsible for nearly 70% of monthly SMS sales) will set you up with a powerful channel. 

SMS messages in Klaviyo flows can be set up so SMS-subscribed customers receive both SMS and emails or so that they receive only SMS.

Note: You can choose one method for all flows or set the method per flow.

To set up your flow to send SMS messages to SMS subscribed customers and send email notifications all customers (regardless of SMS subscription status), you'll want to set up your flow as seen below:

With this set up, the email is triggered and then a conditional split is placed after the email. The logic of the conditional split will send SMS subscribed customers down the "Yes" path, and the SMS unsubscribed customers will go down the "No" path.

To set up your flow to send SMS messages to SMS subscribed customers and send email notifications to the rest of your customers, you'll want to set up your flow as seen below:

With this set up, before the customer communication is sent out, customers will be separated into "Subscribed to SMS" and "Not Subscribed to SMS." The logic of the conditional split will send SMS subscribed customers down the "Yes" path and will receive an SMS message, and the SMS unsubscribed customers will go down the "No" path to receive the email.