{"product_id":"ttgo-t-call-v1-4-esp32-wireless-module-sim-antenna-sim-card-sim800h-module-unsoldered","title":"TTGO T-Call V1.4 ESP32 Wireless Module SIM Antenna SIM Card SIM800H Module Unsoldered","description":"\u003cmeta name=\"description\" content=\"Buy TTGO T-Call V1.4 ESP32 Wireless Module SIM Antenna SIM Card SIM800H Module Unsoldered online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003eTTGO T-Call V1.4 ESP32 Wireless Module SIM Antenna SIM Card SIM800H Module Unsoldered\u003c\/h1\u003e\n\n\u003cp\u003eThe TTGO T-Call V1.4 is an integrated ESP32 microcontroller development board with embedded SIM800H GSM\/GPRS module, enabling cellular connectivity for IoT and remote monitoring applications. Professional engineers and IoT developers use this module to build standalone cellular communication systems without requiring external modem components. This product solves the critical challenge of integrating wireless connectivity with microcontroller functionality in space-constrained applications, offering a compact all-in-one solution for 2G cellular communication, SMS transmission, and data connectivity.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe TTGO T-Call V1.4 combines the powerful dual-core ESP32 processor with the SIM800H cellular module on a single PCB, eliminating the need for external GSM modems. The ESP32 handles local processing, WiFi connectivity, and Bluetooth functionality, while the SIM800H module manages 2G\/GPRS cellular communication over a standard micro-SIM card slot. The board features an integrated antenna connector for external SIM antenna enhancement, improving signal reception in weak coverage areas. The unsoldered variant ships with all components pre-assembled except for specific connection points, allowing developers to customize their integration approach based on project requirements.\u003c\/p\u003e\n\n\u003cp\u003eThis module operates on 5V power supply with integrated voltage regulation, drawing approximately 2A peak current during cellular transmission. The SIM800H supports quad-band GSM frequencies (850\/900\/1800\/1900 MHz), enabling global cellular coverage across most regions. Communication between the ESP32 and SIM800H occurs via UART interface, allowing developers to send AT commands for controlling cellular functions. The board includes a 3.7V lithium battery charging circuit with protection, making it suitable for portable IoT applications. Built-in debugging capabilities through USB serial interface facilitate rapid prototyping and firmware development.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eESP32 Development Board with Integrated SIM800H GSM Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTTGO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eT-Call V1.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal\/Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7 days on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping\u003c\/td\u003e\n\u003ctd\u003e1-5 days from Bengaluru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003e7-8 days across India\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003e24\/7 via Email and WhatsApp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMicrocontroller\u003c\/td\u003e\n\u003ctd\u003eESP32 Dual-Core 240MHz with 520KB SRAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCellular Module\u003c\/td\u003e\n\u003ctd\u003eSIM800H Quad-Band GSM\/GPRS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e5V USB or 3.7V Lithium Battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eUART Serial, USB Micro-B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSIM Card Slot\u003c\/td\u003e\n\u003ctd\u003eMicro-SIM Card Socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAntenna Connector\u003c\/td\u003e\n\u003ctd\u003eSMA Female for External SIM Antenna\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Current Draw\u003c\/td\u003e\n\u003ctd\u003e2A during cellular transmission\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Charging\u003c\/td\u003e\n\u003ctd\u003eIntegrated TP4056 Lithium Charger with Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Frequencies\u003c\/td\u003e\n\u003ctd\u003eGSM 850\/900\/1800\/1900 MHz GPRS Class 12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rate\u003c\/td\u003e\n\u003ctd\u003eGPRS up to 85.6 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIntegrated SIM800H Module: Eliminates need for external GSM modem, reducing PCB footprint and component count for compact IoT designs\u003c\/li\u003e\n\u003cli\u003eDual-Core ESP32 Processor: 240MHz processing capability with 520KB SRAM enables complex local processing and WiFi\/Bluetooth connectivity simultaneously\u003c\/li\u003e\n\u003cli\u003eExternal Antenna Support: SMA connector allows connection of high-gain SIM antenna for improved cellular signal reception in remote locations\u003c\/li\u003e\n\u003cli\u003eBuilt-in Battery Charging: TP4056 lithium charger with protection circuit supports portable applications without external charging modules\u003c\/li\u003e\n\u003cli\u003eUART Communication: Dedicated serial interface between ESP32 and SIM800H enables reliable AT command protocol implementation\u003c\/li\u003e\n\u003cli\u003eUSB Debugging Interface: Micro-USB port provides serial console access for firmware development and real-time debugging\u003c\/li\u003e\n\u003cli\u003eMicro-SIM Support: Standard micro-SIM card slot compatible with all major cellular carriers worldwide\u003c\/li\u003e\n\u003cli\u003eUnsoldered Configuration: Allows customization of connection points based on specific project integration requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRemote IoT Monitoring Systems: Deploy environmental sensors, temperature loggers, and air quality monitors in locations without WiFi infrastructure using cellular GPRS data transmission\u003c\/li\u003e\n\u003cli\u003eGPS Tracking Devices: Combine with GPS modules to create real-time vehicle tracking, asset monitoring, and personal safety devices with cellular location reporting\u003c\/li\u003e\n\u003cli\u003eIndustrial Alarm Systems: Implement remote alarm notification systems for factories and warehouses that send SMS alerts and GPRS data to central monitoring stations\u003c\/li\u003e\n\u003cli\u003eSmart Metering Applications: Build utility meter reading systems that transmit consumption data via cellular network for automated billing and consumption analytics\u003c\/li\u003e\n\u003cli\u003eEmergency Communication Devices: Create standalone emergency alert systems that function independently of WiFi infrastructure for disaster response and rural connectivity\u003c\/li\u003e\n\u003cli\u003eAgricultural IoT Solutions: Monitor soil moisture, weather conditions, and crop health in remote farmland with cellular data transmission for precision farming\u003c\/li\u003e\n\u003cli\u003ePortable Data Logger: Develop battery-powered data acquisition systems that record sensor information and upload via GPRS when cellular coverage is available\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eBegin by inserting a micro-SIM card with active 2G\/GPRS plan into the SIM card slot on the board. Connect the TTGO T-Call V1.4 to your computer via the USB micro-B port and install the CP2104 USB-to-UART driver if not automatically detected. Download the Arduino IDE and add ESP32 board support by configuring the board manager with the appropriate JSON URL. Select the TTGO T-Call V1.4 board from the board selection menu and configure the UART pins for SIM800H communication, typically GPIO16 (RX) and GPIO17 (TX). Flash example sketches that demonstrate AT command transmission to the SIM800H module for basic functionality testing such as checking signal strength, sending SMS messages, and establishing GPRS connections.\u003c\/p\u003e\n\n\u003cp\u003eFor optimal cellular reception, attach an external SIM antenna to the SMA connector on the board, particularly in areas with weak signal strength. If using battery power, connect a 3.7V lithium cell to the battery connector and enable the charging circuit through firmware configuration. Implement proper power management by putting the ESP32 into deep sleep mode between data transmission cycles to extend battery life significantly. Use the UART serial monitor at 115200 baud rate to debug AT command responses and troubleshoot connectivity issues. For production deployments, implement error handling routines that manage temporary network unavailability and retry logic for failed data transmissions.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between TTGO T-Call V1.3 and V1.4?\u003c\/summary\u003e\n\u003cp\u003eThe V1.4 version includes improved power management circuitry, better PCB layout for reduced electromagnetic interference, and enhanced battery charging protection. The V1.4 also features more stable UART communication between the ESP32 and SIM800H module, resulting in fewer dropped connections and more reliable AT command execution compared to earlier versions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this module with 4G\/LTE networks?\u003c\/summary\u003e\n\u003cp\u003eNo, the SIM800H module supports only 2G GSM and GPRS networks. It cannot connect to 3G, 4G, or LTE networks. However, it remains functional in most regions as carriers maintain 2G infrastructure for legacy device support. For 4G capability, consider the TTGO T-Call Plus which features the SIM7600 module, though at higher cost and power consumption.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat power consumption should I expect during GPRS data transmission?\u003c\/summary\u003e\n\u003cp\u003ePeak current draw reaches approximately 2 amperes during active cellular transmission, with average consumption around 800mA during data sessions. In idle mode with GPRS connection maintained, the module draws approximately 5-10mA. In deep sleep mode with periodic wake-ups, consumption can be reduced to under 1mA, making battery-powered deployments feasible for applications with intermittent data transmission requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs soldering required for the unsoldered version?\u003c\/summary\u003e\n\u003cp\u003eThe unsoldered version comes with all major components pre-assembled and soldered. Specific connection points may require soldering depending on your integration approach, such as battery connector or antenna adapter connections. Most users can operate this board without additional soldering, though basic soldering skills are recommended for custom modifications or battery integration.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I send SMS messages using this module?\u003c\/summary\u003e\n\u003cp\u003eUse the AT+CMGS command through the UART interface to send SMS messages. First, set the SMS mode using AT+CMGF=1 for text mode, then use AT+CMGS=\"phone_number\" followed by the message text and Ctrl+Z to transmit. The SIM800H module handles the SMS transmission through the cellular network, and you receive confirmation responses indicating success or failure of the operation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum distance for external SIM antenna?\u003c\/summary\u003e\n\u003cp\u003eThe SMA connector supports standard coaxial cable up to 10 meters in length without significant signal degradation. For longer cable runs, use low-loss coaxial cable rated for RF applications. The external antenna provides approximately 5-7dB gain improvement over the onboard antenna, significantly enhancing reception in weak signal areas such as basements or remote locations.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eOrders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return and warranty policy?\u003c\/summary\u003e\n\u003cp\u003eWe 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eWhy Buy from The Engineer Store\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Products: Sourced directly from authorized distributors with authentication\u003c\/li\u003e\n\u003cli\u003eExpert Team: Our technical team validates every product before listing\u003c\/li\u003e\n\u003cli\u003eFast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse\u003c\/li\u003e\n\u003cli\u003ePan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata\u003c\/li\u003e\n\u003cli\u003ePayment Options: COD, U\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuy TTGO T-Call V1.4 ESP32 Wireless Module SIM Antenna SIM Card SIM800H Module Unsoldered Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003eTTGO T-Call V1.4 ESP32 Wireless Module SIM Antenna SIM Card SIM800H Module Unsoldered\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.\u003c\/p\u003e\n\u003cp\u003eOur team in Bengaluru is available 24\/7 to support your journey from product selection to project completion.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43847479656611,"sku":"TES-EV00006471","price":2262.04,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/TTGO-T-Call-V1.4-ESP32-Wireless-Module-SIM-Antenna-SIM-Card-SIM800L-Module-Unsoldered-1-314x252.jpg?v=1703854873","url":"https:\/\/www.theengineerstore.in\/zh-hans\/products\/ttgo-t-call-v1-4-esp32-wireless-module-sim-antenna-sim-card-sim800h-module-unsoldered","provider":"The Engineer Store","version":"1.0","type":"link"}