What is SMS and why it remains a relevant channel?
SMS is one of the most widely used communication technologies in the world. Even with the growth of internet based messaging apps, SMS continues to play a central role in how businesses and consumers communicate.
This article explains what SMS is, how it works, and why it continues to be a trusted channel for business messaging.
What is SMS?
SMS stands for Short Message Service. It is a standardized technology that enables short text messages to be sent between mobile devices using the cellular network rather than the internet.
An SMS message is typically limited to 160 characters and can be sent and received on almost all mobile phones worldwide. Because SMS does not rely on apps, Wi-Fi, or mobile data, it works across devices, networks, and regions with very high reliability.
What does SMS stand for?
SMS stands for Short Message Service. It is a globally adopted protocol defined by mobile network standards that allows short text messages to be exchanged between phones across different operators and countries.
This standardization is a key reason SMS has achieved near universal reach!
Key characteristics of SMS
SMS has remained widely used for decades due to a set of characteristics that distinguish it from other messaging channels.
Text based communication
SMS is designed for short text messages. Images, videos, and rich media are handled through MMS or other channels, not standard SMS.
Uses the cellular network
SMS is delivered through mobile network signaling channels rather than the internet. This allows messages to be delivered even when data connectivity is unavailable.Universal reach
SMS is supported by almost every mobile device and operator globally, making it one of the most accessible communication channels available.160 character limit
A standard SMS supports up to 160 characters. Longer messages are automatically split into multiple parts and reassembled on the recipient’s device.High reliability
Because SMS operates independently of internet traffic, it performs well for time sensitive and critical communication.
How does SMS work?
Understanding SMS also means understanding how messages are delivered behind the scenes.
The delivery process typically includes:
A message is created on a phone or within an application
The message is sent to the sender’s Short Message Service Center (SMSC)
The SMSC identifies the recipient’s network and routes the message
If the recipient device is unavailable, the message is stored temporarily
Once the device is reachable, the SMS is delivered
SMS messages travel through control channels in the mobile network, which helps ensure delivery even during periods of network congestion.
SMS vs internet based messaging apps
Internet based messaging apps offer rich features, but SMS continues to provide unique advantages.
SMS
• Works without internet access
• Requires no app installation
• Supported on virtually all mobile phones
• Optimized for reach and speed
Internet based messaging apps
• Require mobile data or Wi-Fi
• Depend on app installation
• Support rich media and advanced features
• Require both parties to use the same platform
For businesses operating across regions and device types, SMS offers consistent reach and predictable delivery.
What is A2P SMS?
A2P SMS, or Application to Person SMS, refers to messages sent from a business system or application to an individual user. This is the primary way organizations use SMS today.
A2P SMS enables automated and scalable communication from systems such as websites, mobile apps, CRMs, and backend platforms directly to end users.
How A2P SMS works for businesses
A2P SMS is typically delivered using APIs and enterprise messaging platforms.
The flow usually looks like this:
A business system triggers an SMS
The message is sent through an SMS API to a messaging provider
The provider routes the message through mobile operator networks
The SMS is delivered to the recipient’s phone
This setup allows businesses to send large volumes of messages securely and in real time.
Common A2P SMS use cases
Businesses rely on SMS because of its speed, visibility, and reliability.
Because SMS messages are typically read within minutes, they are well suited for urgent and time sensitive communication.
What is SMS marketing?
SMS marketing is the use of SMS to send promotional or informational messages to opted in recipients. It is commonly used to deliver offers, updates, and reminders directly to customers’ mobile phones.
Modern SMS marketing is powered by A2P SMS APIs, allowing businesses to automate campaigns, personalize content, segment audiences, and manage consent and opt outs at scale.
Why SMS remains a relevant channel
Despite the rise of newer digital channels, SMS continues to play an important role in business communication.
SMS continues to be widely used because it:
Reaches users without requiring apps or internet access
Delivers messages quickly and consistently
Works across devices, networks, and regions
Supports transactional and time sensitive communication
Integrates easily into digital systems via APIs
For many use cases, SMS is used alongside other channels rather than replaced by them.
SMS and business messaging with LINK Mobility
LINK Mobility supports businesses in using A2P SMS as part of a secure and scalable messaging strategy. Through enterprise grade platforms and APIs, organizations can connect systems, applications, and customers through reliable mobile messaging.
SMS plays a central role in authentication, notifications, and customer engagement. When combined with other messaging channels, it supports coordinated communication journeys across the customer lifecycle.
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