xiaomi redmi note 2

I'm very pleased about my Xiaomi Redmi Note 2 (Prime) but sometimes I wonder why all my conversation partners complain about the poor voice quality whily talking to them. They always tell me that they can't really understand me and that it sounds like I'm 20 meters away from my phone! After a...

Please help?? My phone didnt fall at all or bump into anything I could operate it well just a few mins ago and now the power button doesnt work anymore and i just realized that my volume up button doesn't work too

(sorry for my english) Hi friends , my new xiaomi have crazy bug , sometimes when i unlock my phone the screen don't work it's completely black ,but the soft touch button's and the notify led work well The phone work only if i force the restart. Please help me My phone have a miui v7...