VODAFONE is only the network provider who is take good networking around every area.Cost is little high but you can satisfied with it if you get a brillient network all over india.
3G 2G Network is also very good compared to othe operators now vodafone starded 4G services over major cities of india.
Mobile data cost is high but its ok because of its high speed and coverage area.
Now a day 2G is little slow only while downloading but surfing speed is great.
So my openion is just go for it.