A local rep. shared some more details about the different tariff plans that will be available to iPhone 3G customers of Vodafone India.
Vodafone offers no "unlimited data" plan for iPhone users. That means if you exhaust your monthly data usage, be prepared to shell out an extra Rs 5 per MB of data exchanged.
The monthly rent for iPhone will range from Rs 500 to Rs 1000 depending on your Internet requirements. The lower plan will provide you with 50 MB of free data usage while the upper 1000 plan provides 600 MB of data usage.
This above plans are for postpaid customers. If you want to go for a prepaid iPhone connection, there’s a special data card that is available for a monthly rent of Rs 100 but provides no free data usage.
The SMS and local / STD call charges on iPhone will more or less be the same as existing tariffs offered by Vodafone.
Let’s do some maths. If you are heavy web user, the overall cost would work something like this - Rs 36000 (for handset) + Rs 12000 (yearly rent) + Call Charges + Extra data charges + Taxes.
Contrast that with a BlackBerry Curve from Airtel - Rs 23000 (for headset) + Rs 6000 (yearly rent with unlimited data) + Call Charges + Taxes. Source...