iPhone Wifi malfunctioning


i updated iphone 3.1.3, jailbroke using redsnow.but, tried access cydia, wifi isn't working!in settings wifi on, there no blue or grey'd out wifi logo.it doesn't find wifi router while laptop finds them.my router set 802.11g thats not prob.(my iphone not unlocked)
 

also, before iphone fine wifi worked calls worked everything.then gave cousin went out.when came idk did showed connect itunes , emergency call screen.then stated above updated 3.1.3 , jail broke etc etc
 


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