If your android phone has Wi-Fi tethering (portable Wi-Fi hotspot) functionality, try this widget to turn on & off it. By pressing the icon, the state will be toggled between W-Fi OFF, Wi-Fi ON and Wi-Fi tethering ON.
To enable this widget, long press on the home screen, then select widget, and select Wi-Fi Controller (android 2.3).
For android 4.0 or above, show application list, then select widget tab, and long press the Wi-Fi Controller.
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