Guys I have very bad experiences on the network operator. They gives us many low price phone. And the call charge is also low. Before 3 month I am having a MTS mobile phone with MTS sim. After using some days I fallen to various types of hassle. The network quality is very poor. When I am going for a phone call I listened the phone is busy but actually the phone was not busy at that time. Many time I listen the phone is switched of but the phone is on. When I want to send a massage then I saw SMS is not sent. But the SMS was already sent to other person.
They put callertune in my phone forcefully.
So friends it is very bad operator for your phone.