Hi, I bought b700 model . It had mic problems .Voice wasnt audible for the other party on the call, it was too low . I had given it to authorised service center in T.Nagar, chennai within a week of purchase . They returned my mobile after 1.5 months. When i tested my mobile, there absolutley no voice heard to the other party . When i asked them, what they did all these days . They said it had gone to head office for repair with a complaint...