Vodafone 3g trick hsdpa 3g 3.5g HSPA+ FREE INTERNET kolkata

first recharge with rs 45 150mb 3g for 7 days 

then go to settings then select wireless then mobile network 

then network mode then select wcdma after using 100 mb recharge 

with 2g pack and enjoy its working in kolkata try in your region 

and comment