I have bought htc 8x from mvideo market in tyumen russia 1 mounth ago.when i call someone , they cant hear me sometimes.i gave the htc service center.they changed my phone with the new one.but the second phone has a same problem too. the mic. works normally...because of i can talk with skype without any problem. i think there is problem with wp8 system or something like that.what is the solution for this problem?????