SIM808 Bluetooth Compatible GSM/GPRS/GPS Module
SIM808 Bluetooth Compatible GSM/GPRS/GPS Module
SIM808 Bluetooth Compatible GSM/GPRS/GPS Module
The SIM808 is a compact quad-band GSM/GPRS/GPS module with integrated Bluetooth connectivity, designed for IoT applications requiring simultaneous voice, data, and location tracking capabilities. Professional engineers and IoT developers use this module to build GPS tracking systems, fleet management solutions, emergency alert systems, and remote monitoring devices that require cellular connectivity and real-time positioning. This module solves the critical problem of integrating multiple communication protocols into a single compact form factor, eliminating the need for separate GPS, GSM, and Bluetooth modules in space-constrained applications.
Product Overview
The SIM808 module operates on quad-band GSM frequencies (850/900/1800/1900 MHz) with integrated GPRS Class 12 data connectivity, enabling reliable cellular communication across global networks. The embedded GPS receiver provides high-sensitivity positioning with TTFF (Time To First Fix) of approximately 35 seconds in open sky conditions, while the Bluetooth 2.1 interface allows wireless pairing with mobile devices and peripherals. The module communicates via standard AT commands through a UART interface, making it compatible with microcontrollers like Arduino, STM32, and Raspberry Pi without requiring complex driver installations.
What distinguishes the SIM808 is its integrated power management system with built-in charging circuit for Li-ion batteries, eliminating the need for external power conditioning circuitry. The module features a ceramic antenna for GPS reception and an external GSM antenna connector, providing flexibility in antenna placement for optimal signal strength. Operating at 3.3V to 4.2V, the SIM808 draws approximately 100mA during GSM transmission and 80mA during GPS operation, making it suitable for battery-powered applications with proper power management design.
Key Specifications
| Specification | Details |
| Product Type | Multi-Protocol Wireless Module |
| Brand | SIMCom |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| GSM Bands | 850/900/1800/1900 MHz quad-band |
| GPRS | Class 12, 4+1 timeslots, max 85.6 kbps |
| GPS Sensitivity | -159 dBm tracking, -165 dBm acquisition |
| Bluetooth Version | Bluetooth 2.1 EDR |
| Operating Voltage | 3.3V to 4.2V DC |
| Interface | UART (TTL level), SPI for SD card |
| Dimensions | 24mm x 24mm x 3.2mm |
| Temperature Range | -40°C to +85°C operating |
Key Features
- Quad-band GSM/GPRS connectivity with global network compatibility across 850/900/1800/1900 MHz frequencies for seamless operation in any region
- Integrated GPS receiver with high sensitivity (-165 dBm) and fast acquisition time, enabling accurate location tracking within 10 meters in open sky conditions
- Bluetooth 2.1 EDR wireless interface supporting profile connectivity with smartphones and Bluetooth peripherals for remote data access and control
- Built-in Li-ion battery charging circuit with power management, reducing external component count and simplifying battery integration in portable devices
- Standard AT command interface compatible with all major microcontroller platforms, enabling rapid prototyping without proprietary firmware requirements
- Compact 24x24mm form factor with ceramic GPS antenna and external GSM antenna connector, optimizing PCB space while maintaining signal quality
Applications and Use Cases
- GPS Vehicle Tracking Systems: Real-time fleet monitoring with GPRS data transmission and Bluetooth smartphone connectivity for driver notifications and route optimization
- Emergency Alert Devices: Wearable SOS buttons that transmit GPS coordinates via GSM to emergency contacts while establishing Bluetooth connection to paired mobile devices
- IoT Environmental Monitoring: Remote sensor nodes that collect environmental data, transmit via GPRS to cloud servers, and allow local Bluetooth configuration without network connectivity
- Smart Asset Management: Tracking valuable equipment and containers with GPS positioning, cellular data logging, and Bluetooth pairing for inventory management applications
- Telematics and Automotive: Vehicle diagnostic systems combining real-time GPS tracking, GSM-based data transmission, and Bluetooth integration with in-vehicle infotainment systems
- Smart Agriculture: Farm equipment and livestock tracking with GPS positioning, GPRS data upload to cloud platforms, and Bluetooth connectivity for local monitoring stations
How to Use
To implement the SIM808 module, establish serial communication with your microcontroller via UART pins (RX/TX) at 115200 baud rate. Insert a standard 2G GSM SIM card into the module's SIM slot, ensuring the card is activated with an active data plan for GPRS functionality. Power the module through the dedicated power pins with a stable 3.3V to 4.2V supply, preferably using a regulated power supply or battery with capacitive filtering to handle current transients during GSM transmission. Initialize the module by sending the AT command "AT" to verify communication, then configure network settings using "AT+CPIN?" to check SIM status and "AT+CREG?" to verify network registration.
For GPS positioning, enable the GPS engine using "AT+CGNSPWR=1" and allow 35-45 seconds for the first fix acquisition. Retrieve coordinates using "AT+CGNSINF" which returns latitude, longitude, altitude, speed, and course data in standard NMEA format. For GPRS data transmission, establish a TCP/IP connection using "AT+SAPBR" commands to set the bearer profile, then use "AT+HTTPINIT" for HTTP operations or "AT+CIPSTART" for socket connections. Configure Bluetooth pairing mode with "AT+BTPOWER=1" and "AT+BTVIS=1" to enable device discovery, then pair with your smartphone using standard Bluetooth pairing procedures. Always implement proper error handling for AT command responses, as network conditions and GPS signal strength directly affect module behavior and response times.
Frequently Asked Questions
What is the difference between SIM808 and SIM900 modules?
The SIM808 integrates GPS and Bluetooth capabilities that are not present in the SIM900, which is a GSM/GPRS-only module. The SIM808 is ideal for applications requiring location tracking and wireless peripheral connectivity, while SIM900 is suitable for basic cellular communication. SIM808 also includes a built-in battery charging circuit, whereas SIM900 requires external charging management.
How accurate is the GPS positioning on the SIM808?
The SIM808 GPS receiver provides horizontal accuracy of approximately 10 meters under open sky conditions with clear satellite visibility. Accuracy degrades in urban canyons or indoor environments due to signal obstruction. The module supports DGPS (Differential GPS) for enhanced accuracy if your application requires sub-10-meter precision. Cold start acquisition takes 35-45 seconds, while warm start (with recent ephemeris data) takes 5-10 seconds.
Can I use the SIM808 for voice calls in addition to data and GPS?
Yes, the SIM808 supports voice calls through its GSM interface. You can make and receive calls using AT+D command for dialing and AT+A for answering. However, voice and data cannot operate simultaneously on 2G GSM networks. The module will disconnect GPRS when handling voice calls and automatically reconnect afterward, making it suitable for applications requiring both voice alerts and data transmission.
What power supply specifications should I follow for reliable operation?
Use a regulated 3.3V to 4.2V power supply with minimum 2A capacity to handle GSM transmission current spikes reaching 1.5A. Include a 100µF electrolytic capacitor and 100nF ceramic capacitor close to the module's power pins to stabilize voltage during transients. If using a battery, ensure it can deliver 1.5A peak current without voltage sag below 3.3V. Improper power supply design is the most common cause of module reset and communication failures.
How do I enable and use Bluetooth connectivity on the SIM808?
Enable Bluetooth using AT+BTPOWER=1 command, then set visibility mode with AT+BTVIS=1 to allow device discovery. The module will appear as "SIM808-BT" in your smartphone's Bluetooth device list. Pair using the default PIN (typically 0000 or 1234), then establish serial port profile connection. Once paired, you can send AT commands through Bluetooth serial connection for remote configuration and data retrieval without cellular connectivity.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
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- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
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