Very bad Chinese product, phone was performing good for 1. 5 years, the problem started after warranty. Phone Hangs and switches off by itself, usually 5 to 6 times a day. I got it formatted almost 3 times but the problem still persist, even the service center is helpless. I found that others who have been using this phone for over one year are facing this problem.
This phone is built to last for maximum of 1 to 2 years if you are lucky, later on problem starts. Better avoid this phone, I am not sure about other Chinese phones if they have same strategy to sell their phones.