From past 5 years I am using Airtel Mobile Operator sim card and I never face any type of problem it the Airtel Mobile Operator, I have also Tata docomo mobile sim card but, in docomo I am facing so much network problem, I had used so many other company sim card also but I am only satisfied with Airtel Mobile Operator, the Internet speed is also so nice in this mobile operator.
Now I am only waiting for the Airtel 4G in my city after that Airtel mobile operator become the first company who gives all the facilities in our city, And one thing I like best that is all the customer care solve our problem in same time.