Click on the following link for product video demo presentation. https://youtu.be/1uGBi3tJ-js

Not approved from PTA you need to register it from PTA, it will only work for few months, and to purchase this device we need NOC from your school, University.

The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5-4.5V power supply, optional power on self starting (default) and control start. The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset. The size of the module is 50*48, all the new and original device. The computer can give early computer debugging USB module power supply, a very large amount of data under the condition of the recommended current more than 1A. Standby dozens of MA data can be set to provide dormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card. The serial port circuit: support for 3.3V single chip microcomputer. TTL serial port support 3.3 and 5V single chip microcomputer. The SIM card circuit to increase the SMF05C ESD chip. Antenna circuit: guarantee short and straight, so as to ensure the signal strength. PCB display screen printing mark: each interface, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual. Two power supply interface: VCC5, 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5-4.5V power supply, ibid., suitable for lithium battery. Control pin all leads. A TTL level, compatible with 3.3V and 5V. The two antenna interface, the default SMA straight head, connector for IPXmini antenna. One way of speech interface, the way Mike interface. The control interface of each pin description: GND - GND SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level RST - SIM900A reset, active low VCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V VCC5----DC 5V input VCC4------DC3.5--4.5 input Onboard Resources: Serial port circuit (with protection) Antenna interface circuit (SMA bend female port) SIM card circuit (flip SIM slot) 4*3.5 fixture hole 4pcs SIM900A serial port output terminal Specifications: Size: 50mm x 48mm Net weight: 28g Weight: 38g Package Included: 1 x SIM900A V4.0 kit 1x Power Cable 1x Antenna SMS Send Receive Example code Connect GSM RX pin to Arduino Digital pin 9 GSM TX pin to Arduino Digital pin 10 GND should be common with Arduino GND and provide atleast 1A 5V supply to GSM module. Cop and paste the code below in arduino IDE. //ERFINDER CODE #include <SoftwareSerial.h> SoftwareSerial mySerial(9, 10); // RX, TX void setup() { mySerial.begin(9600);  // Settingthe baud rate of GSM Module   Serial.begin(9600);  // Settingthe baud rate of Serial Monitor (Arduino)   delay(100); } void loop() {  if(Serial.available()>0)  switch(Serial.read())   {  case 's':   SendMessage();   break;   case 'r':  RecieveMessage();   break;  }  if(mySerial.available()>0)  Serial.write(mySerial.read()); }  void SendMessage() {  mySerial.println("AT+CMGF=1");  //Sets the GSM Module in Text Mode   delay(1000);  // Delay of 1000 milli seconds or 1 second  mySerial.println("AT+CMGS=\"+92300XXXXXXX\"\r"); //Replace x with mobile number    delay(1000);   mySerial.println("Iam SMS from GSM Module");// The SMS text you want to send   delay(100);  mySerial.println((char)26);// ASCII code of CTRL+Z   delay(1000); }  void RecieveMessage() {  mySerial.println("AT+CNMI=2,2,0,0,0"); // AT Command torecieve a live SMS   delay(1000);  }

SIM900A Wireless GSM GPRS Module with Antenna (NOT Approved from PTA)


Note: This GSM May only work for 3 months and need registration from PTA, you need to register it with your own CNIC, and to purchase it we need NOC from your School college University


Dual-Band 900/ 1800 MHz
GPRS multi-slot class 10/8
GPRS mobile station class B
Compliant to GSM phase 2/2+
Class 4 (2 W @900 MHz)
Class 1 (1 W @ 1800MHz)
Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
SIM application toolkit
Supply voltage range : 3.1 ... 4.8V
Low power consumption: 1.5mA(sleep mode)
Operation temperature: -40°C to +85 °C


SIM900A chip parameters:
Power saving mode: Typical power consumption in SLEEP mode is 1.5mA
Frequency bands:SIM900A Dual-band: EGSM900, DCS1800. The SIM900A can search the two frequency bands automatically. The frequency bands also can be set by AT command.
GSM class: Small MS
GPRS connectivity:GPRS multi-slot class 10 (default) , GPRS multi-slot class 8 (option)
Transmitting power: Class 4 (2W) at EGSM 900, Class 1 (1W) at DCS 1800
Operating Temperature: -30ºC to +80ºC
Storage Temperature: -5ºC to +90ºC
DATA GPRS: download transfer max is 85.6KBps, Upload transfer max 42.8KBps
Supports CSD, USSD, SMS, FAX
Supports MIC and Audio Input
Speaker Input
Features keypad interface
Features display interface
Features Real Time Clock
Supports UART interface
Supports single SIM card         
Firmware upgrade by debug port
Communication by using AT commands
The power supply voltage: 5 V
Power supply current: > 1 A


Some useful links
1: https://create.arduino.cc/projecthub/1NextPCB/home-automantion-system-using-gsm-sim900a-b9e5af?ref=part&ref_id=11332&offset=6
2: https://components101.com/wireless/sim900a-gsm-module
3: https://www.electroniclinic.com/gsm-sim900a-with-arduino-complete-guide-with-gsm-based-projects-examples/
4: https://www.electroniclinic.com/gsm-sim900a-with-arduino-complete-guide-with-gsm-based-projects-examples/#GSM_Sim900A_Description
5: https://microcontrollerslab.com/sim900a-gsm-module-pinout-examples-applications-datasheet/
6: https://www.instructables.com/GSM-SIM900A-With-Arduino/


Package Include:
1pc SIM900A 900/1800 MHz Wireless Extension Module GSM GPRS Board + Antenna + Battery cable