The article introduces the concept of open source private LTE and 5G networks, which can be built using affordable hardware and software. This technology allows for secure and reliable communication over a wide area, making it suitable for various industries such as manufacturing, oil and gas, and public sector. The article also provides information on how to start building an open source mobile network and the benefits of using open source technology. Additionally, it mentions the possibility of using unlicensed spectrum for private networks, which can be a cost-effective option.