First Hand Experience
Hi,
I think my opinion would be of value here as I have been exactly in the same position.
Wht BSNL wud do in ur case is tht they wud charge you for all th MBs
tht get transferred from Aug. 25 to Aug. 31 as per their current per MB rate.
I got my connection installed on 28th of a 30-day month. So, I was charged about Rs. 150 /-
for the amount of MBs I used in the last 3 days, added to my regular phone bill for that month.
From th next month onwards ur monthly bandwidth limit wud be put in place
and u'll be charged ur monthly rental as usual plus charges if u exceed th limit.
I hope ths clears up th situation for u.
Happy surfing!
Ravi