Hi, since i ve uptated my iphone 4S to the last current version of IOS which is 6.1.2, my wifi has greyed out. i noticed on the beginning, some difficulty for being connected temporally, wifi gone after some minutes / hours. lately it didnt work at all and eventually greyed out. apparently latest ios may cause it or perhaps wifi chip not working anymore i know Bluetooth is not greyed yet. i made a full restore, reset general settings, network setting, it didnt work for now. anyone has met that kind of issue?