Dear friends i have changed my bsnl broadband plan from 500 combo(night unlmtd) to 500 unlimited. As per the bsnl portal track order says the new plan has been provisioned on 14/07/2011, and i used about 0.7 gb chargeable and total 16.8 gb. How will they calculate my next bill do they charge me for plan change and how they calculate between these two plans, anybody please help me to calculate my next broadband bill. thanks in advance