4G Dongles are still unofficially supported : r/synology
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4G-N12 B1｜Modem Routers｜ASUS Global
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USB WiFi Adapter for PC, EEEkit 600Mbps Wireless Network Adapter with High Gain Antenna, Dual-Band 2.4G/5GHz Wi-Fi Dongle Compatible with Desktop, Laptop, Windows, Mac OS, Linux - Walmart.com
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Wireless 4G LTE WiFi Router USB Dongle 150Mbps Modem Sim Card For Car GPS Player | eBay
4G LTE USB Dongle Wireless WI-FI Modem Stick for USA (EE/CPT/4GDONGUSA) | Xtrons
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SIM7600CE-JT1S 4G DONGLE with antenna, industrial grade 4G communication peripheral, mainly applicable for China
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