Overview of Wireless Wide Area Network (WWAN) - GeeksforGeeks
CradlePoint R500-PLTE wireless router
Amazon.com: EXVIST 4G LTE Industrial Mini PCIe to USB (Type-C 3.1) Adapter W/SIM Card Slot for WWAN/LTE 3G/4G Module Suitable for M2M & IoT Applications Like Raspberry Pi Industrial Router IP Camera :
Lantronix G520 Series G527 - wireless router - WWAN - 802.11a/b/g/n/ac, Bluetooth 5.1 - 3G, 4G - desktop - G527GP2AS