IPhone 4 Greyed Out Wifi

I have an iPhone 4 that I dropped partway in water. Due to the wetness, I turned it off ASAP and then threw it in a bag of rice. I waited a day and then powered it on again. It seemed to be partly working; I could sync to my PC and also could faintly make out the screen. For some reason, I decided to go ahead and update from iOS 5.0 to 5.0.1 while the phone was down. This went fine, although my screen was dark so I couldn't verify very much. I then took my phone apart and placed it in tupperware with rice. I waited another day and everything appears to be working, except for the wifi (greyed out) / bluetooth (can enter menu but it never finds it). I had read that some people have had issues with wifi after updating to 5.0.1, but I am also thinking it could be a hardware issue due to possible water damage or reassembly. On a side note, I have not jailbroken.
I was wondering if anyone here could provide me with some troubleshooting instructions. I have reset the network settings, hard restarted, and restored my iPhone to no avail. My wifi address is N/A, and my bluetooth has an address, but I can't turn it on. I have an IMEI and my modem firmware is 04.11.08.
Thanks,
Brett

Another bump hoping to catch someone's eye~
@diesel: My phone was dry enough to work. As a matter of fact, everything except the wifi/bluetooth is functional. I can make calls, check email over 3G, and do most of the vital functions of a phone (just not on wifi). I figured it would be fine because the flash LED was constantly on before putting it into the rice due to the moisture shorting out pins. After it dried, I recharged it and the LED was not on. As an electrical engineer, I understand the risks of moisture and how easily chips can blow. And as far as a replacement goes, I will be getting a 4S in March when my contract expires. I would like to use the phone for some home automation via wifi, so fixing it would be convenient.
If anyone has encountered a similar problem, any advice (such as issues that could arise from semi-careless reassembly) would be appreciated.
Thanks,
Brett

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<Edited by Host>

Dear all,
I´m from Argentina, I have an Iphone 4s 32GB purchased on June 2012.
When I updated to Ios 7.00 no wifi issues. Last week I updated to 7.0.2 instantly starts wifi issues, over heating and stopped working. I was tried every I read in this post and others and nothing change. I Tried hard reset to factory settings and nothing. I am sure that the problem is with Ios 7.0.2, because the problem start at this moment.
Anybody knows if Apple will release a fix for this bug?
Thanks for all your comments and We can try to help togheter.
Martin

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when my iphone started up again, my wifi button greyed out and i couln't do a thing with it
or see something only the greyed out wifi button,
i tried everything apple support told me
all types of reset's with and without back-up
reset via itunes, you name it ...
my iphone isn't jailbroken..
i looked on the internet and found alot forums with people complaining about this issue..
and apple still doesn't have a good solution too it.. they should be a shamed too sell such a expensive smartphone, with alot of promisses
but when there is a issue we are on our own... or they only have a solution that works with 50% of the people who has trouble with wifi
i bought my iphone on the internet, so now i have to send it back to italie so they can send me back a new one (7 days guarantee)
even this i really don't like, there is a apple store 30km from my place, but i can't replace my iphone there.
i thought apple was apple.. and they worked with the serial numbers.. but no..
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sorry for my english
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