GlossaryWhat Is Longcode?

What Is Longcode?

Longcode

A longcode (also known as a long number) is a standard, 10- to 15-digit phone number used for person-to-person (P2P) messaging or low-volume application-to-person (A2P) communications. Unlike shortcodes, which are typically 4–6 digits and designed for high-throughput campaigns, longcodes support two-way messaging, voice, and international reach – but at significantly lower throughput and scale.

Longcodes are often used for customer service messaging, alerts, appointment confirmations, and small-scale marketing interactions.

What it means for telemedia

In telemedia, longcodes play a supporting role in A2P messaging ecosystems, especially for use cases that prioritise conversational engagement, international interoperability, or regulatory compliance. While shortcodes and sender IDs dominate high-volume broadcast traffic, longcodes offer a more cost-effective and less conspicuous option for certain types of traffic.

Telemedia service providers use longcodes for two-way messaging scenarios, lead capture, and personalised interactions – often integrating them into chatbots, IVR fallback flows, or SIM-based campaigns in countries where shortcode registration is expensive or restricted.

They are also useful for services that require sender recognition (e.g. when SMS needs to appear from a consistent number) or where grey route avoidance is important.

Example in use

A mobile subscription service in Southeast Asia uses longcodes to send personalised renewal reminders and support messages to its subscribers. The same number allows users to respond with keywords like “HELP” or “STOP,” creating a low-friction, compliant customer interaction flow.

Because local shortcode registration is cost-prohibitive, the service uses longcodes to ensure consistent communication without breaching local regulations.

Why it matters

Longcodes provide a flexible, accessible messaging channel that complements other A2P tools in the telemedia stack. They offer global reach, two-way communication, and low-cost setup – making them ideal for support messaging, onboarding, and regulated opt-in flows.

However, longcodes come with limitations in message volume, delivery prioritisation, and throughput – so they’re not suited for mass marketing or time-sensitive alerts. For telemedia providers, using longcodes effectively means understanding where personalised, persistent, or regulatory-compliant messaging is required – and balancing them with high-capacity channels.