I cannot get wi-fi on my iphone - says no wi-fi and is not highlighted despite wireless networks being available

HELP!
i cannot get wi-fi on my iphone - says no wi-fi and is not highlighted despite wireless networks being available

Hi, my iPhone 4S had a similar problem in February 2011, after several attempts to revive it, and nothing has worked, as I was traveling to the U.S. in May, and was still under warranty at no cost to me changed.
But now a year later the new phone looks similar to make a software upgrade problem. The WiFi only works to no more than 2 meters from the antenna WiFi, then away more disconnects, not a router problem as all other wireless devices will work fine as ever. What happened? my phone will have lost its antenna gain?. I live in Argentina there is no Apple Store here, I do not travel to the U.S., from what I saw on the website of apple change the phone for an equal (which will surely have the same problem) miss u $ s 200. I am really disillusioned with Iphone. I think it must have been damaged wifi antenna that receives wifi signal but low sensitivity or a lot, will this model of Iphone has a general problem with any batch of antennas?, because I happened on 2 different phones

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