An SMS long code is a standard phone number that sends and receives traditional phone calls as well as text messages, with its use cases including corporate phone numbers, automated phone systems, direct client callbacks, and chat applications. However, sending large volumes of SMS long code messages can put response rates at risk due to spam filtration by phone carriers. In contrast, an SMS short code is a special 5 or 6-digit number that sends application-to-person (A2P) messages to mobile devices, making it more efficient and effective for connecting with audiences and fulfilling business objectives. Short codes are better suited for large quantities of time-sensitive A2P messages such as promotional alerts, account notifications, and appointment reminders. The choice between long code and short code ultimately depends on the specific needs of each business, with short codes being preferred when seeking quicker responses, increasing conversions, and avoiding spam filters.