A small handful of Android devices (mostly the Nexus line), Jailbroken iPhones, and other rooted Android phones are all capable of being used as WiFi hotspots without the need to enable a hotspot service with your cell carrier. This may seem kind of pointless for a deactivated smartphone, but it’s not.
WiFi Tethering essentially turns your smartphone into a wireless router. When your phone has a data connection, it can share that connection with all of the other devices connected to it. When it doesn’t have a data connection, it still functions as a wireless router – or more accurately, as a switch.
In this sense, you can use WiFi Tethering to connect other wireless devices to each other, in other words, creating a quick and dirty LAN (Local Area Network). You can use this network to share files, play multiplayer games, and anything else you’d normally do with a LAN.
With a Jailbroken iPhone, the app you’ll want for this is MyWi, found in the Cydia app store. Rooted Android users will have the best luck with Android Wifi Tether. And for those lucky few on Android devices that don’t need to be rooted, simply go into the tethering settings and enable Portable Wifi Hotspot.
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