Show HN: A USB-C LTE modem that gives my computer a phone line github.com

Koppar published the Rev B design files for a 4-layer USB-C LTE modem board built around Quectel’s EC25-EUX module. It is designed to provide a computer with LTE data, SMS and voice calls, routing call audio through a USB sound card; the board is being ordered, and firmware and call testing are still to come.