First of all data transfer speeds on Tata Docomo 2g internet are erratic. Their data packs billing is manipulated and designed to cause atleast 10-15% loss to the customer.For example, a Rs.69 pack for 2.5 gb actually gives you only something like 2.2gb. why do they have to advertise 2.5 gb ?? they could say 2.2 gb with correct billing and be truthful !I have observed this difference by comparing with metered usage on mobile partner as well as a simultaneously running seperate bandwidth usage meter.Didn't find such excess 2g data usage deductions with other operators.