Koppar-AI/koppar-lte-modem

A phone line over USB-C: LTE data, SMS and voice calls with the call audio on USB. A 4-layer KiCad board designed by Koppar from a one-page spec.

GitHub repository with 52 stars and 0 forks.

Topics: ec25, kicad, lte, open-hardware, pcb, quectel, rp2040, sms, usb-c, voip

Open provider repository

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2026-11-03: 52 stars and 0 forks.