My Wi-Fi doesn't work on my iPhone 4S (I have IOS 6)?

Ok so basically my phone isn't letting me turn on my Wi-Fi. The Wi-Fi bar thing to turn on is grey like faded and doesn't let me turn it on. And I CAN't update my phone to IOS 7 bc the phone was originally from verison and it was unlocked and put into t mobile and if I update it will lock the phone again and chances are that it won't be able to unlock again. So overall I just want to kno why my phone isn't letting me connect to the Wi-Fi

Your 3g is ON
so you are not needing Wi-Fi(free internet access).
turn off your 3g(paid for internet access)

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