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Wi-Fi is not a cellphone technology. WiFi runs on the same frequency as some cordless house phones and microwaves among other things. Some 'hotspots' are free as others leave them open for all to use (librarys, universites, coffeshops, etc). Others are closed and you can only gain access if you pay like in Starbucks and in Airports. There is also a third kind of Wifi, the kind that is locked down and you can only get on with authentication. This is used in people's home (if they don't want to share Internet), business, etc.
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