A pocket WiFi hub or hotspot is usually a better choice than a dongle. In most cases, a portable WiFi hub should cost the same on a plan as a USB modem. But unlike a USB modem, pocket WiFi hubs are battery-powered and will need recharging. Most can be plugged into power while you're using them, however.

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Turn your existing mobile broadband dongle into a WiFi hotspot

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How do I setup an AstroBox Gateway without a dongle/hotspot?

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