You can check your internet balance on Vodafone by two ways i.e. with USSD and SMS.
How to check 3G Internet Balance on Vodafone with USSD:
Dial *111*5*2# or *111*6# to check 3G data plan and remaining data balance on Vodafone.
How to check 3G Internet Balance on Vodafone with SMS:
Type DATA BAL and send it to 144, you will get SMS of remaining data balance and validity for your Vodafone number.
How to get GPRS Settings on Vodafone Number:
To get GPRS settings for your Vodafone number you just need to send a SMS ALL to number 111.
You can dial 111 toll free number for any query related to Vodafone and click here for more Vodafone quick tips.