There are two ways to know that.
(1) To Get Infomation about your GPRS balance on vodafone india you have to just Dial *111# Then Choose English Language by Pressing 2, Then you have to Press 5 (Which is for Knowing 1>GPRS Active Plan, 2> GPRS Balance).
Summary : *111# >2>5>2. [ > this means after getting result of *111# you have to answer it by pressing 2 then after getting the result answer it by pressing 5 and then again 2]
That's work on everywhere within in India. ©
(2) If you're still confused for my previous way then, Just Sms DATA BAL to 144. Which works everywhere within india. ©
I Hope, You Got That
Thanks for reading this post!