Wi-fi hotspots are unsecured so you can use them. Home wi-fi's tend to be secured, and require a password to connect to the router.
Some routers also use MAC filtering, so that only devices with their MAC address in the router can connect.
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~Midnight Draven
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."
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