I have used vodafone sim for many year and have many problems with it since the sevices provided by it are very bad. It provides offers only based on occasions that is for festivals thats it. And 3g net provided by it is very slow in our area. It is suitable only in cities not at rural areas.
And the cost of offers is very high. This network is somewhat good at sms services but not at main balance and internet services. Earlier, it has provided very high speed net but at present it has reduced its net speed and offers too I think this situation has arised due to the increased number of users. This network has to be improved much.