How do I install a SIM card for my 4G Wi-Fi router or Mobile Wi-Fi?

How do I install a SIM card for my 4G Wi-Fi router or Mobile Wi-Fi?

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USING METHOD: Insert the SIM card and install the battery. Even if your SIM card is compatible with the hotspot WIFI device, it may not be plug and

Estink 4G LTE USB WiFi Modem, Mobile Internet Devices with SIM Card Slot, 300Mbps High Speed, Portable Travel Hotspot Mini WiFi Router,Built in

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4G LTE AC1200 Dual Band Wi-Fi Router, Model: LT500-Cudy: WiFi, 4G, and 5G Equipments and Solutions

4G185 4G LTE-Advanced Pocket Mobile WiFi Router