SOME BODY KNOWS, WHY THE WIFI ITEM ITS UNAVAILABLE IN MI IPHONE 4S

I NEED HELP.
MY IPHONE 4S, SUDDENLY SHOWS THE WIFI ITEM UNAVAILABLE, I CAN´T ACTIVE OR INACTIVATE IT.
I MADE EVERY THING BUT NOTHING´S HAPPENED.
APPLE WON´T HELP ME
SOME BAODY CAN?

Try a reset. Press & hold the Power and Home buttons simultaneously, ignoring the red power off slider, until the Apple logo appears. Then release both buttons. This should not affect any content on the iPad, it is similar to rebooting your computer.

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