Installed iOS7 update and now wifi and Bluetooth not working

My daughters 4s has never skipped a beat - perfectly reliable. Just updated iOS7 with update and now both wifi and Bluetooth not working. Wifi is greyed out and when you go into bluetooth the busy twirly symbol is constantly going round. Can someone please help me as I'm pulling my hair out! My other Daughters iphone 4s is fins BUT she has not downloaded latest update - and she won't until this is resolved. If needs be I will take to store and DEMAND for it to be sorted out - either by repair or replacement as it is wholly a seemingly software issue and nothing wrong with the phone.
Gutted really as I am a huge Apple fan and customer with ipods, phones, iMac & iPads all around. If this is not resolved I fear an Apple drought may begin!

..... ty for the link, however this is the first result googling the issue..... of course it did not work....
it is really unbelivable that plenty 4s devices suffered the wifi troubleshooting just after upgrading to ios7, and finally.... i should burn wifi and bluthoot, and another hardware problems should cause % battery value is disappeared....
all this in one shot....
firmaware is not well working or is somebody bombing our devices to force us to switch to newest?

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