Wi-Fi is almost ubiquitous now but that doesn't mean it's always comes cheap. Hotels especially love to nickel and dime people for Wi-Fi, sometimes offering different prices for slightly different speeds and often restricting or charging extra for multiple devices. If you're traveling internationally and want to avoid roaming costs on your mobile devices it can be especially aggravating. Luckily Apple makes it simple to share the Wi-Fi connection on your Mac with your iPhone, iPad, or even other Macs.
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