Short Message Service (SMS)

In practice, SMS is the standard protocol for text-based messaging between mobile devices and applications. In customer operations, it is used as a service channel for inbound support, outbound notifications, appointment reminders, delivery updates, two-factor authentication, and survey collection. SMS reaches customers on their phones without requiring an internet connection or an app, which gives it broad reach and relatively high open rates compared to email.

A healthcare provider uses SMS for appointment reminders, prescription pickup notifications, and a simple inbound text channel for low-complexity scheduling changes. Patients can text a keyword to confirm, cancel, or reschedule an appointment without calling. The system handles most of these interactions automatically. For requests that require more detail, it hands off to a live agent or directs the patient to call. This reduces inbound call volume for common scheduling tasks and improves patient adherence to appointments.

This shows up as a high-reach, low-friction channel that works well for both notifications and simple transactional interactions. SMS does not replace richer support channels for complex issues, but it handles a meaningful class of routine contacts effectively, particularly in industries where customers are used to receiving important updates by text. For teams building omnichannel support, SMS is an essential consideration, especially in healthcare, logistics, and financial services where timely, accessible communication is operationally important.