Bro how you will get massive bill unless you download a lot without knowing your free data.. 0.05p for 1MB means 0.5p for 10mb and 5rs for 100mb ..
how you cannot know your data usage even after 100mb unless you are careless and download a lot without knowing your data.. Also there is a feature in all
android mobile called Data Restriction , just set the billing cycle and your data limit , android will warn you of your usage is close to end or exausted just keep a watch then...
and keep your data off when not in use when your usage is close to end..
Further more Rs 5 for 100mb is wont get you with huge postpaid bills unless you are downloading in gb's which is not at all recommended in Rs 149 plan