Amazon.com: AURSINC MMDVM Hotspot USB HAT Board with Simlpex Hotspot Multi-mode Digital Voice Modem Supports C4FM YSF NXDN DSTAR P25 DMR | Compatible with Windows Linux Android System | BER, DMR, TX
Tux Machines — This dirt cheap 4G LTE modem on a USB stick can be hacked to run mainline Linux