In the New Zealand telecommunications landscape, SMS Short Codes are the gold standard for business-to-consumer communication. These are 3 to 6-digit phone numbers specifically provisioned for high-volume, automated messaging (A2P). Unlike standard mobile numbers (long codes), short codes are designed for reliability, brand recognition, and compliance with local carrier requirements.
Do Businesses Need Their Own Short Code?
No. Many customers use a built-in code successfully.
On the Starter plan without a short code, when you send a message we analyse the message content and send it on an approved short code dedicated to that type of message.
When a mobile receives a message from you, they have a five-day window to reply.
Using the built-in Short Codes work well for:
- Appointment reminders
- Service alerts and notifications
- Customer support replies
- Internal team communications
- Two-factor authentication (2FA)
When do you need a dedicated Short Code?
- Wanting customers to text you first (inbound-initiated conversations)
- Running regular SMS marketing campaigns
- Building brand recognition around a specific number
- Running competitions or keyword campaigns (e.g. "Text WIN to 4567")
- Sending high volumes where a consistent sender identity matters
Short Codes vs. Long Codes: Why New Zealand is Different
While some international markets allow business messaging via standard mobile numbers, New Zealand carriers heavily regulate these channels. Using a short code provides several distinct advantages:
- Superior Deliverability: Short codes are pre-approved by NZ carriers (Spark, One NZ, 2degrees), meaning they bypass many of the aggressive spam filters that often block long-code traffic.
- High-Volume Throughput: Built for scale, short codes can send thousands of messages per minute, making them essential for time-sensitive alerts or large marketing blasts.
- Consumer Trust: A dedicated short code (e.g. 8888) acts as a verified brand identity. Customers are significantly more likely to engage with a 4-digit code than an unknown 10-digit mobile number.
- Compliance: In New Zealand, alphanumeric headers (sending from a "Name" instead of a number) are not supported. Short codes enable the 2-way communication required for legal opt-outs.
⚠️ You can't use your own mobile number!
NZ networks and the Department of Internal Affairs actively block business SMS sent from standard 021/022/027 numbers. This is to keep the channel trustworthy and prevent the kind of spam that other countries struggle with. TNZ provides a compliant Short Code on signup so you don't have to wait or apply for one yourself.
Types of SMS Short Codes in New Zealand
Choosing the right code depends on your budget and how you want your customers to interact with your brand. There are two primary categories used by TNZ clients:
| Feature |
Standard Rate Short Code |
Free-to-Text (Zero-Rated) |
| Cost to Mobile User |
Typically 20c per sent message |
$0.00 (Always Free) |
| Cost to Business |
Monthly fixed cost. Business pays for outbound messages. No cost for receiving inbound messages |
Monthly fixed cost plus a fee per SMS sent and received |
| Best Use Case |
2FA, Reminders, Internal Alerts |
Marketing, Competitions, Customer Support |
| Cost Instruction |
If the mobile is required to send to the short code, instructions must state "Standard charges apply" or "Replies cost 20c" |
No requirement to explain costs (although "free reply" improves response rates). Must still comply with Spam Act regulations (including an unsubscribe instruction such as "Reply STOP to OptOut") |
Can I choose my Short Code Number?
No. Unfortunately this is not possible.
Generally, "Standard Rate" short codes begin with a 4xxx number, and "Free-to-Text" short codes begin with a 8xxx number.
Compliance and "Reply STOP" Functionality
Under the Unsolicited Electronic Messages Act 2007, every commercial SMS sent in New Zealand must include a functional, easy-to-use unsubscribe facility. Short codes facilitate this perfectly:
- Automated Opt-outs: TNZ’s platform automatically handles "STOP" keywords, ensuring you never accidentally message an unsubscribed contact.
- Legal Requirements: Marketing messages must be free for the user to opt-out. This is why many NZ businesses prefer Free-to-Text codes for promotional messages.
Pricing for Dedicated Short Codes
If you decide a dedicated Short Code is right for your business, here's what to expect:
| Type |
Setup Time |
Setup Cost |
Monthly Cost |
| Shared Short Code (default) |
Instant |
Free |
Included |
| Dedicated 4-digit Short Code |
4 weeks |
$600 |
$299 |
| Dedicated 6-digit Short Code |
4 weeks |
$300 |
$89 |
Setup Time includes mobile networks reviewing and approving your short code's use case and provisioning the code.
TNZ Handles Everything
Provisioning a dedicated Short Code involves applications to all three NZ carriers (Spark, One NZ, 2degrees), Department of Internal Affairs approval, and technical integration with the TNZ platform. We manage all of it on your behalf:
- Carrier applications and compliance paperwork
- Technical integration and dashboard configuration
- Ongoing support and compliance management
How to Decide
Start with a shared Short Code if you are:
- Sending reminders, alerts, or notifications
- Just getting started with SMS
- Budget-conscious and don't need consistent brand recognition
Upgrade to a dedicated Short Code if you are:
- Running regular marketing campaigns where brand recognition matters
- Running "Text KEYWORD to 4567" style promotions
- Wanting customers to initiate conversations with you
Not sure? Contact our team for a recommendation based on your use case, or book a dashboard demo. For details on how the Sender ID is configured at the account or user level, see Setting the Sender ID on SMS Messages.