Hi Friends, in india people choose mobile connection depends on public reviews and also on shop keeper plans. But there are other factors as well. In india each telecom operators are giving best services in market. i.e. Cheap plans, more data, free SMS, free STD plans etc.
While choosing the network check for the number of users in your area more important. Then take anyones of your friends mobile and test the data speed on Sppedtest.com to see the actual 3G speed of that network. Always remember the mobile companies are not big, important is how they treat their customers. I am using airtel from last 11 years with no connection error & more importantly the coverage is too good. The numbers of spectrum holds by Airtel is anytime more than all telecom companies and therefore Airtel gives the best services in india.