This is very strange - exactly the same thing happened to me: my iphone was replaced because i couldn't activte wifi anymore. on the new phone wifi worked for about 3 weeks then the same problem re-occured: wifi switch is greyed out.. In theory, wireless connections and cellular networks should live happily in harmony on your iphone or ipad. your device uses automatic switching technology to pop you on known wi-fi networks and send you back to cellular when you're out of range, and it works great... most of the time.. Experiencing wi-fi issues on the iphone 6 is something that many users faced with. some of the possible issues are: wifi cannot detect wifi hotspot and keep searching continuously. can find wifi hotspot, but cannot connect to it..
To manually check for and install a carrier settings update:. make sure that your device is connected to a wi-fi or cellular network. tap settings > general > about. if an update is available, you'll see an option to update your carrier settings.. A common problem in the iphone 4s, sometimes the wi-fi button will be grayed out and unclickable. this problem seems to be related to thermal shock — the problem may be temporarily fixed by simply putting the phone in the refrigerator for 15 minutes, or under a lamp for 30 minutes..
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