If you’re using SMS to communicate with customers, chances are you’ve heard the terms short code and long code. But what’s the real difference between the two—and how do you know which one is right for your business?
Let’s break it down.
What Is a Short Code?
A short code is a 5- or 6-digit phone number (e.g., 12345 or 555888) designed for high-volume, high-speed messaging. These are often used by large brands to send mass texts like alerts, promotions, or authentication codes.
Short codes are pre-approved by mobile carriers and come with strict compliance rules—think opt-in requirements, message templates, and content vetting.
What Is a Long Code?
A long code is a standard 10-digit phone number (e.g., 555-123-4567) that looks just like a regular phone number. Long codes support two-way texting and are ideal for more personal, lower-volume messaging.
They’re easier and cheaper to set up but come with limitations—especially around throughput and compliance for large-scale campaigns.
| Feature | Short Code (e.g. 12345) | Long Code (e.g. 555-123-4567) |
|---|---|---|
| Message Volume | Very high (ideal for mass messaging) | Moderate (limited throughput) |
| Speed | Lightning-fast delivery | Slower delivery rate |
| Brand Perception | Professional, trusted for enterprise use | Feels more personal, like a 1:1 conversation |
| Compliance Requirements | Strict (pre-registration, opt-in, content approval) | More flexible (10DLC registration) |
| Two-Way Messaging | Now supported via Message IQ | Fully supported |
| Use Case Fit | Campaigns, alerts, large-scale outreach | 1:1 support, drip campaigns, low-volume workflows |
| Cost | Higher (monthly lease + carrier fees) | Lower (standard usage fees) |
Scenarios: When to Use Each
✅ Use a Short Code When:
You’re sending high-volume, time-sensitive messages (e.g., flash sales, security alerts).
You need carrier trust and better deliverability at scale.
Your messages are transactional or marketing-based, and you can justify the additional cost.
You want a memorable, branded experience (e.g., “Text PIZZA to 12345”).
✅ Use a Long Code When:
You’re having personalized conversations (e.g., sales follow-ups or customer service).
You’re sending moderate volume messages (drip campaigns, appointment reminders).
You need a quick, low-cost setup to get started.
You’re testing or validating a messaging strategy before investing in a short code.
The Regulatory Factor
Short codes are more expensive and time-consuming to set up for a reason: they’re heavily regulated. Mobile carriers require detailed review of your intended use, messaging language, and opt-in process. This helps reduce spam, phishing, and abuse on the SMS channel.
While long codes also require A2P (Application-to-Person) registration under new 10DLC rules, the barrier to entry is much lower.
Final Thoughts
There’s no one-size-fits-all answer. The right choice depends on your goals, budget, and message volume. In fact, many companies use both—long codes for personalized communication and short codes for high-impact campaigns.
And now that Message IQ supports two-way messaging on short codes, you don’t have to compromise.
Want help deciding which option is best for your use case? Get in touch and we’ll walk you through it.
