IPhone 4S Wi-Fi Switch Greyed Out?

I have had this iPhone 4S since January 2013, and I have experienced no problems until recently.

I've looked around Apple support pages, and I have noticed that this is most likely caused by a broken Wi-Fi antenna, and a cause of this could be using the iPhone in a hot climate. Since I've had the phone in January, I have not used in anywhere that would be considered hot - but since four days ago I have been on holiday in the south-east of Turkey, where temperatures have been reaching near 40 degrees Celsius (104 in Fahrenheit). Could this hotter, more humid climate be the cause of this problem?
Would this issue repair itself after being out of the heat for a while, or would it need to be repaired?
Would this problem have not occurred if I did not use my iPhone or Wi-Fi whilst in a hot climate?

This problem seems difficult and/or expensive to fix, and although my iPhone has insurance, I'm still hoping there's an easier solution.

I'm using the latest iOS version available for the 4S (6.1.3), Airplane Mode is off etc., etc. - I've tried all the obvious solutions, plus the 'hairdryer method' several times, but to no avail.

Is there a simple way I can solve this problem from home, or will I need to get my iPhone properly repaired or replaced?

Jailbreak redsn0w can't let me download in Cydia?

I installed Cydia using redsnow and when I was done, there's a cydia app in the menu. So I tapped it and pressed featured which is because I wanna download themes. So I tried to click one but it says "Can't find package" and it says I should download more sources. How do I download these sources? Or at least how do I get around to this obstacle? I had an iphone 3gs with ios 6.1.3 before jailbreaking if that's anywhere useful.

I use too much data on my iPhone?

My bill cycle doesn't end until the 14th and I just got a text saying I uses 90% of my data… The thing is, they texted me yesterday saying I only used 65%?! Where did all this data go in one day!

How to put music on iPhone without cord?

My iPhone cord doesn't work when syncing with my Mac, so I was wondering if there's another way to get my music into the official music app without using the cord?

Added (1). I can't use Wi-Fi sync because that requires prior connection

Why do I have 9 icloud calendars in Outlook?

I have no problem syncing and everything looks fine in both Outlook and on my iPhone (4S), but for some reason there are a number (currently 9) of icloud calendars showing in Outlook.
Does anyone know why and if this is at all important, please?

Can i use my iphone apps on a ipad?

I have iphone but would like ipad and if i have apps on my Iphone but i say changed to a different phone would i be able to log into the ipad with the same log in details as i use on the iphone and get the same apps, also would they be at the same place like on Simpson's tapped out i'm on level 31 so would it start from that level on the ipad or would i be taken back to level one cos its a new device?

Looking to take on photography & need a good camera?

At the moment I'm using an iPhone so anything will be an improvement my price range is £300-£450 500 max. I like the look of Nikon with the d3100 & the d5100 but have also been recommended the Sony A58, what's your opinions, thank you to all that will help make this difficult decision. If you have Instagram look at some of my pics @rjwilmott to get a feel of what I will be taking pictures of. This is more than a hobby for me & would like one of the best cameras on the market in my price range, I will take into consideration anyone else's opinions too.

Added (1). I have been taking pictures for the past 18 months with my iPhone and macro/widescreen lens & feels its time to move on up, I've even sold a few pictures printed on to canvas to people.

Added (2). Sorry I didn't mean to sound like I was going by the look, I want the camera that suits me best the hold the feel just wanted to know what yous people think of the 3 I have seen & held so far