Why wifi can't turn on

how i can do ? I upgred ios7 my wifi can't turn on?

Les digo algo amigos, sin que me quede nada pr dentro, no se que le esta pasando a Apple, pero no es normal que uno compre un equipo de mas de USD 600 y sucedan esta cosas! Yo tengo un 4S estaba funcionando perfectamente. Hasta que hice la actualización a IOS 7, el equipo esta súper lento para abrir especialmente los ajustes. No puedo activar el wi fi, la batería no dura nada!!!!
Alguien que me pueda dar una explicación lógica a esto ?
Saludos!

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~~~~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
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Why wifi can't turn on

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