The WiPhone is a simple, open-source modular phone designed for hacking hardware and software. It runs on Arduino and is stripped down to avoid distractions, making calls and sending text messages using VoIP over WiFi. The phone lacks a cell radio to limit tracking, but can be connected to a mobile network via a hotspot. It is designed for tinkerers and DIY enthusiasts, with the ability to be customized at the hardware and software levels. The phone can also facilitate off-grid messaging through LoRa technology. Overall, the WiPhone is seen as a tool that respects the user’s right to repair and control their own communication network.
https://www.wiphone.io