SMS short codes explained

What a short code is

A short code is a short phone number, much shorter than a normal mobile number, used to send and receive text messages at scale. Customers text a keyword to it, and businesses send alerts, passcodes and campaigns from it. Because it is short and memorable, it works well in adverts, on screens and in shops.

Dedicated, shared and vanity

Why use a short code

• Customers can reply. Short codes support two-way messaging, so customers can confirm, vote, opt in or opt out.
• High throughput. They are built for high-volume traffic such as one-time passcodes and bulk alerts.
• Memorable. A short number is easy to put on adverts and packaging.
• A sender customers recognise. The same number every time builds familiarity.

Short code or Sender ID?

An alphanumeric Sender ID shows your brand name, but it is one-way: recipients cannot reply to it. A short code or a dedicated number can receive replies. Many businesses use both: a Sender ID for notifications and a short code for two-way campaigns.

Typical uses

• Authentication and one-time passcodes
• Transaction and service alerts
• Keyword campaigns, such as "text WIN to 1234"
• Polls, surveys and competitions
• Subscriptions and opt-in or opt-out services
• Interactive services that reply to a customer's message

What to prepare

Short codes are provisioned with the operators, so lead times and requirements vary. Decide what the code will be used for, which keywords customers will use, and how people will opt in and opt out. Clear consent and an easy way to stop messages are essential.

Short codes with Ruach

Ruach offers dedicated, shared and vanity short codes for campaigns, alerts, one-time passcodes and interactive messaging, for high-throughput delivery in Nigeria and Africa. See short codes and the short code onboarding form, and read how the SMS API fits in.

Frequently asked questions

How long is a short code?

Short codes are only a few digits long. The exact length and format depend on the market and operator.

Can customers reply to a short code?

Yes. Replies and keywords reach your application through a webhook, so you can respond automatically.

Is a shared short code cheaper than a dedicated one?

Shared codes are generally used for smaller needs, but pricing depends on your volumes and use case. Contact us for a quote.

Can I use a short code for one-time passcodes?

Yes. Dedicated short codes are commonly used for authentication traffic because of their throughput and consistent sender.