Iphone 4  sous iOS 7.0.4

Bonjour, j'ai mis à jour mon Iphone 4 à jour sous iOS 7.0.4 et depuis il est lent! Il n'a plus les qualités d'un iphone. Il est plus lent pour taper des messages l'écran est moins réactif. Que faire?

Turn the phone off and take the SIM card out and insert it again and then turn the phone back on

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