Amazon.com: 4G LTE USB WiFi Modem, LTE/4G 150 Mbps USB Mobile Module with SIM Card Slot, High Speed Portable Travel Hotspot Mini Router Supports USB, UART for PC, Industrial Computer : Electronics
Hackable $20 Modem Combines LTE And Pi Zero W2 Power | Hackaday
FC-PCI FACET-Card (miniPCIe + SIM for 3G/4G modem) – fit IoT