I using vodafone from last 2 years. I have postpaid vodafone sim. In the postpaid sim we have to use for calling, data, SMS after using it for 1 months it gives total amount of used network and bill is generated after one months of use. The all plans available for the operators are valid for 1 months. Plans are not available for a particular days and interval. If we need to use a service for few days we can activate it and deactivate manually, If we do this then we have to paid pro-data basis charges. Thats you don’t need to pay full service charge only you have to pay charges for days of use. Ex. If you activate a 10GB data plan which is for Rs.999 and if you activate use and then deactivated in same day the you will charge only Rs.36 which is equal to Rs.999/30 days.
This is fastest 3G I ever used idea is also slower than Vodafone. I got about 1.5MBPS speed.