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SimCom SIM900A GSM Module with SMA Antenna

SimCom SIM900A GSM Module with SMA Antenna

Regular price Rs. 1,653
Regular price Rs. 1,895 Sale price Rs. 1,653
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  • This is SimCom SIM900A GSM Module with SMA Antenna
  • Quad-Band GSM/ 850/900/1800/1900MHz compatibility
  • Suitable for various microcontrollers (Arduino, Raspberry Pi, ARM, AVR, PIC, 8051)
  • Power supply range of 12V 1A to 2A maximum
  • Strong signal reception capabilities
  • Ideal for GSM-based microcontroller projects, surpassing other GSM modems like SIM300
  • Option to directly connect microphone and speaker for calls, with LINE IN available
  • Supports communication through RS232 with DB9 connector, TTL pins, and I2C pins
  • Enables voice calls, SMS messaging, and GPRS functionality

SimCom SIM900A GSM Module with SMA Antenna

The SIM900A Modem is a wireless module manufactured by SIMCOM. It is a Dual Band GSM modem operating on the 900MHz frequencies. The modem has the capability to automatically search for these two bands. Additionally, users can also manually set the frequency bands using AT Commands. The baud rate of the modem can be configured in the range of 1200-115200 through AT commands.

The SIM900A Modem is designed to be ultra compact and offers wireless connectivity. It features an interface that allows connection with a PC or a microcontroller using the RS232 Chip (MAX232). This modem is suitable for various applications such as SMS, voice, and data transfer in the M2M (Machine-to-Machine) interface.

The modem includes an onboard regulated power supply, enabling connection to a wide range of unregulated power sources. With this modem, you can easily perform functions like making audio calls, sending and receiving SMS, reading SMS, and handling incoming calls using simple AT commands. It is a comprehensive GSM module designed in a Surface Mount Technology (SMT) format and utilizes a powerful single-chip, allowing for compact dimensions. The SIM900A GSM Modem offers both serial and TTL outputs.. 


  • Quad-Band GSM/ 850/900/1800/1900MHz
  • Compatible with arduino, raspberry pi, arm, avr, pic, 8051
  • power supply 12v 1amp to 2 amps max
  • Use in the area of full signal strength.
  • Perfect suited for GSM based Microcontroller Projects (better than SIM300 and other GSM Modems)
  • Option for connecting MIC and SPEAKER directly to GSM MODEM for calls (LINE IN also available)
  • Supports communication through RS232 with DB9 Connector, TTL Pins and I2C Pins
  • CALL SMS GPRS facility - MIC input, LINE input and SPEAKER output pins

Package Includes:

  • 1 x SimCom SIM900A GSM Module with SMA Antenna


Model  SIM900A
Baud Rate  1200-115200
Dimensions  5 x 4 x 3cms 
Weight 5 grams

Shipping & Returns

  • All orders confirmed before 3 pm IST are shipped on the
    same day, barring rare pickup delays on holidays or disturbances
  • Delivery time in Metro cities is 1-3 days, Others it is
    3-7 days. It varies based on location, reliant on courier services
  • Return window: 7 days from receipt unless stated
    otherwise. No refunds/replacements after
  • Returns only for non-working/damaged products are accepted
  • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
  • Refunds are processed within 3-4 working days post inspection and approval.

For more details, please check our Shipping and Return Policy

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1. What are the frequencies that the SIM900A module works on?

The SIM900A module is built with a Dual Band GSM based SIM900A modem from SIMCOM and works on frequencies 900MHz

2. Is the baud rate configurable on the SIM900A module?

Yes, the baud rate is configurable from 1200-115200 through AT command

3. What is the interface available on the SIM900A module?

The SIM900A module comes with an RS232 and TTL output interface

4. What are the applications of the SIM900A module?

The SIM900A module is suitable for SMS, voice as well as data transfer application in M2M interface. It can be used for making audio calls, sending SMS, reading SMS, attending incoming calls, and more through simple AT commands

5. Is the SIM900A module suitable for microcontroller projects?

Yes, the SIM900A module is perfect suited for GSM-based microcontroller projects and is compatible with various microcontrollers such as Arduino, Raspberry Pi, and more