hello , i have a issue of WiFi problem , i cant detect any wifi even i have switch on my wireless modem . sometimes it detect , sometimes dont ... i have reset n erase all my network setting . but yet still the same . what happen ? plz help me , im gonna get mad

actually i bought tis iphone from a fren of mine ... i dunno whether is jb or not ... i have no idea ... suddenly tis issue wifi problem came to me ... so in case wat should i do ?

hello ... my iphone 3g have some problem .... yesterday i was Eras my iPhone , after finish Erase , the iphone just appear a Apple logo , no response ... after i restart or reset the phone , still the same , no response ... jus a Apple logo appear there ... help me !