wlan light problem in modem

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TP-Link TD 8151N Modem/Router... I bought this modem yesterday & configured it into my pc as instruction in booklet & its working fine in pc but the problem is that every light is on in modem except wlan light i did factory reset too twice but still that light didnt came& nw the 2nd problem is that when i try to connect my cell frm wifi.. it shows my wifi & got connectd to it as well ( in open mode, no password) but after paring it show " network cannot be used to access internet, connect anyway? "plz tell me how to use wifi in my cell & why there is no wlan light in my modem, i gt it replaced too thinking that there is sumthing wrong with my modem & this is a new 1
 

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