Description: Note: you need to register this device from PTA with your own CNIC, it will work for few month and to purchase this device we need NOC from your school, University. Module Model: SIM800L Quad-band 850/900/1800 / 1900MHz Used in GSM-based projects, GPS-based projects, projects robotics, or 8051 / AVR / ARM / PIC / Arduino / Raspberry pi-based projects GPRS multi-slot Class12 connectivity: max. 85.6Kbps (Down load / Up load) GPRS mobile station class B Controlled by AT commands (3GPP TS 27.007, 27.005 and SIMCOM AT commands Enhanced) Supports Real Time Clock Supply voltage range 3.4V ~ 4.4V Supports A-GPS Supports 3.0V to 5.0V logic level Low power consumption, 1 mA in idle mode Compact dimensions 23mm x 35mm x 5.6mm Package includes: 1 x SIM800L GPRS GSM module with antenna 1 x spring antenna 2 x Headers Arduino sample code: #include <SoftwareSerial.h>   //SIM800 TX is connected to Arduino D8 #define SIM800_TX_PIN 8   //SIM800 RX is connected to Arduino D7 #define SIM800_RX_PIN 7   //Create software serial object to communicate with SIM800 SoftwareSerial serialSIM800(SIM800_TX_PIN,SIM800_RX_PIN);   void setup() {   //Begin serial comunication with Arduino and Arduino IDE (Serial Monitor)   Serial.begin(9600);   while(!Serial);     //Being serial communication witj Arduino and SIM800   serialSIM800.begin(9600);   delay(1000);     Serial.println("Setup Complete!");   Serial.println("Sending SMS...");     //Set SMS format to ASCII   serialSIM800.write("AT+CMGF=1\r\n");   delay(1000);     //Send new SMS command and message number   serialSIM800.write("AT+CMGS=\"923005930028\"\r\n");   delay(1000);     //Send SMS content   serialSIM800.write("TEST");   delay(1000);     //Send Ctrl+Z / ESC to denote SMS message is complete   serialSIM800.write((char)26);   delay(1000);     Serial.println("SMS Sent!"); }   void loop() { }

SIM800L GSM GPRS microSIM card Core board arduino


SIM800L Module is a small GSM/GPRS Module and ideal for small ideal projects. The module supports quad-band GSM/GPRS network, available for SMS and GPRS message data remote transmission. 
The SIM800L communicates with the microcontroller via UART port, supports command including 3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands. Besides, the board also supports A-GPS technique which is called mobile positioning and gets the position by mobile network. This feature makes it can also be a tracker module.


The SIM800L can work up to 2Amps current at peak. It also has a low power consumption feature that consumes 1mA Current in sleep mode. You need to power the module from 3.7V to 4.2V as per the datasheet. More than that will damage the module. You can use a buck converter to achieve this voltage range.


Features:
2G Quad-band 850/900/1800/1900MHz
Receive and make calls using the speaker and microphone outputs
Receive and send SMS
Listen to FM radio broadcasts
GPRS multi-slot class12 connectivity: max. 85.6kbps(download/upload)
GPRS mobile station class B
Controlled by AT Command (3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands)
Supports Real Time Clock
Operating Voltage range 3.4V ~ 4.4V
Supports A-GPS
Low power consumption, 1mA in sleep mode
Micro SIM Card


LED Blinking status:
If the power to the SIM800L is enough, the onboard LED starts blinking. The frequency of the blinking denotes the following:


Every second:  searching for a network.
Every three seconds: connected to a network.
Twice per second: connected through GPRS.


Some useful links
1: https://lastminuteengineers.com/sim800l-gsm-module-arduino-tutorial/
2: https://create.arduino.cc/projecthub/EasyMades/sim800l-gprs-module-with-arduino-at-commands-d3f3f7


package contents
1: SIM800L module
2: Antennas
3: Male headers