These function like a tiny smartphone. You insert a SIM card, and the stick connects directly to cellular networks to provide internet access where there is no Wi-Fi.
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Public Wi-Fi is notoriously insecure. Using a cellular dongle provides a private, encrypted connection that keeps your data safe from hackers. These function like a tiny smartphone
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Here are some of the most reliable options currently available: Wireless USB WiFi Adapters For PC & Laptop - Netgear