There are times when your Wi-Fi network just can’t provide the connection to the internet you need. Perhaps you are at work and the office Wi-Fi just can’t cope with all the iPads and iPhones accessing it so it slows your browsing to a crawl (or your boss decides to change the password for the same reason). .

Maybe you are in a hotel and can’t connect all your devices to the room’s Wi-Fi at once.
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