Air tel has launched 250 rs plan with 400 MB download limit..no other renal. I hv few Q1. Can we check data usage how much how I have used at any point of time2. do they hv any top up for unlimited night usage3. is 400 MB is enough for normal browsing chating but no download etc how is the service in bangalorePlease replycan we make monthy parment through airtel website ...