Why won't my iPhone 3gs detect or connect to wifi?

I have had my iPhone 3gs for almost a year now. Rarely do I use the wifi, I find that using my 3g is faster. However, recently I have tried connecting to wifi and my phone cannot detect any sort of wifi, while my laptop and friend's do. I've researched and found that it may be a hardware issue? I'm looking for suggestions on what to do. I have tried reseting my network settings and nothing changed. Thanks!

Did you get it sorted.  Does your 3GS work with WIFI now.  Its been awhile you posted above so wondering how you got along.  I find myself in same situation. Its been like this for the past year.  I have tried everything I read on various forums including this.  I have now booked appointment with apple to get my 3GS checked.  Does anyone with similar experience tell us how long it takes and what happens.  I am going there first time. My 3GS is out-of-warranty. I hope they dont charge a lot.

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    http://support.apple.com/kb/TS2802
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    Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
    Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
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    The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
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    Let's get you back to business, Kahlrich! Where are you located? Are you able to make calls? When did this start? Have you restarted the device since this began?
    YaleK_VZW
    Follow us on Twitter @VZWSupport
    If my response answered your question please click the �Correct Answer� button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!

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