Terminology » Mobile Communication » IM vs SMS: Understanding the Key Differences

IM vs SMS: Understanding the Key Differences

instant messaging

short message service

sms

mobile communication

This page compares IM vs SMS and highlights the key differences between them. Both are common methods used to exchange or transmit messages between devices.

IM vs SMS: A Comparison

Here’s a breakdown of the differences between Instant Messaging (IM) and Short Messaging Service (SMS):

Specifications	IM (Instant Messaging)	SMS (Short Messaging Service)
Full form	Instant Messaging	Short Messaging Service
Application of use	Used in personal desktop computers for instant message transfer.	Primarily used in mobile phones and tablets to transmit short messages.
Backbone	Utilizes internet infrastructure.	Relies on telecom towers to provide the service.
Limit on characters	No character limit.	Has a character limit per message (typically 160 characters for standard SMS).
Charges	Generally free, requires an internet connection.	Charged as per the telecom company’s charging rules.
Coverage	No geographical limitations, can be used globally.	Often limited to the country where the mobile is registered for telecom service. International SMS is possible but usually charged at a higher rate.

SMS Network Architecture and Key Elements

Explore the architecture of SMS networks within GSM, including SMSC, HLR, MSC, VLR, BSC, BTS, and MS. Understand MO and MT call flows.

sms

gsm

network architecture

SMS over LTE: Methods and Call Flows

Explore the two methods of SMS delivery over LTE (SMS over SGs and SMS over IP), along with detailed call flows for mobile-originated and mobile-terminated SMS.

lte

sms

protocol stack

SMS MO and MT Call Flow Explained

Explore the SMS architecture, focusing on Mobile Originated (MO) and Mobile Terminated (MT) call flows. Understand the message signaling between network elements.

sms

call flow

mobile communication