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I have purchased Karbonn K580 from chennai..it some times not reads the memory card.It also shows invalid sim/insert sim for SIM 2 even in betwen call.Loud speaker sound is very low, sometimes unable to hear the ringtone.The default ringtone plays most time when call comes
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D-170, Okhla Industrial Area, Phase-1, New Delhi, Delhi, India - 110020