IPhone 4S won't let me turn on Wi-Fi?

So I have an iPhone 4s and it won't let me turn on the Wi-Fi it's just as if it's not an option even the word "Wi-Fi" isn't high lighted anyone know what to do?

AHAH! I had a 4S - and you have contracted the dreaded Thermal Disease! It seems that 4S is VERY prone to overheating ( does it ever get WARM on you? Really warm?) and that messes with the ability for it to connect to Wi-Fi. I had this happen over a year ago ( I since got a 6!) - while I was 1500 miles from home, on vacation! I drove to an ATT store -and they said it was an APPLE issue. What they told me to do sounds Really crazy - and I'm an adult a career professional in music, and handle all kinds of expensive equipment every day - but I was desperate. So - here goes. Turn on the phone. Close out any running apps. Get a HAIRDRYER ( yes, I know - sounds crazy) and BLAST that phone (out of any case you might have it in) until it is So hot that a big red thermometer is visible with a warning. GOOD! Now shut off the phone, wrap it in plastic, and put it in the freezer for about ten minutes. (At this point, you still think I'm crazy. I can assure that I'm NOT.) At the end of ten minutes, take the phone out. Leave it shut off until it comes to room temperature, all by itself. Cross your fingers, say a prayer, do a dance - and turn the phone on. NOW try to connect to Wi-Fi. SEE? IT WORKED! This is because there's a software flaw that causes the thermometer in the phone to overheat - and what you just put it through resets all that. It got so that I was doing this every few days - but it happened in August, and I knew my contract expired with ATT in December, and I would be getting a new phone - and as long as I could FORCE it to work - I was OK. If you do not believe ME, then you can look on YouTube about how to fix a 4S - or you can dig thru back issues of computer n and phone magazines online. This is So common, that most of the iPhone-owning world knows about this now. So - take a deep breath, TRUST ME, follow all the directions - and you will get your phone back to working order in less than a half-hour. I was frantic and without a phone for days, because I was a non-believer and STUBBORN - so I hope I have convinced you that this is safe and effective. Once you get it to work the first time, you will be confident to do it again if your phone quits accepting Wi-Fi.

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