How to find remaining balance and last date of Airtel Internet Plan

Many of Airtel Subscribers (including me) are using the 99 Rs Internet pack. With this pack which offers upto 1GB of data transfer, there is always a confusion regarding the following

– Till what date is my plan active ?
– How much data have I already used ?
– How much Internet balance do I have remaning ?

So here is a code, which when dialled reveals the remaining Internet balance and date till when the plan is active.

Dial *123*6#

Hope this helps :)