The LTE Raspberry Pi HAT for developing IoT applications is just that. Kickstarter fundraising goal (opens in new tab)The HAT, known as PiTalk, is compatible with all models of Raspberry Pi. (opens in new tab) From small Zero, except Compute Module and Picos (opens in new tab) On the powerful Raspberry Pi 4 Model B (opens in new tab).
Created by Ravinder Singh, an embedded systems engineer based in London, the HAT allows you to place your Pi out of Wi-Fi range (but it must be powered somehow). Built around the Quectel EG25-G Cat 4 module, capable of 150Mbps downstream, 50Mbps upstream, backwards compatible with previous network types, and also global positioning (GPS, GLONASS, Beidou/Compass, Galileo, QZSS) We support this.
It supports voice calls and SMS messages, so you can use it to build your own smartphone, but the Pi with a HAT (opens in new tab) It can also be configured as a Wi-Fi hotspot, video streaming device, or simply for browsing the web. It could also be used in digital signage, where new content can be uploaded to billboards without the need for a Wi-Fi network or physical access. A version of HAT is also available that can only communicate with 2G networks.
Singh also develops USB 4G dongles for Windows and Linux systems that connect via USB. All of his 4G products require a nano-SIM card and get power from a USB port (his Type-C port for HAT, his Type-A port on the host for dongles). Various bundles are available, including one containing a Raspberry Pi board, HAT, various cables, and his HAT and dongle combination. LCD screen, battery powered he UPS, relay connection and PoE HAT are also available.
Full details including pinout can be found on the Kickstarter page. The product will be shipped worldwide, with deliveries scheduled to begin in February 2023. The Kickstarter campaign will run for an additional 29 days at the time of writing.
Please note that crowdfunding a project does not guarantee that you will receive a finished product. You believe in the project and want it to succeed. You are not purchasing a retail product.