Free 4GB/6GB data usage on Vodafone – Validity 90 days at ->June 8, 2012
If you are a Vodafone customer and is planning to switch to other operator for some reasons likes relatively high data rates and calls rates do not worry because in it's customer retention strategy Vodafone IN has come up with offers likes giving 4 GB to 6GB data usages free for 60 to 90 days OR like 30p/min for call rates etc.
What You have to do:
Write SMS PORT Your Mobile Number to 1900
For example: Send this text "PORT 9999999999" to 1900
This offer might be valid in other operators too
Note: This information has got mostly (+)ve feedback from user. It may or may not be true. So try at your own risk