Sep 6, 2012, Dear Friends, it seems the pre paid Air Tel 3 G U S B modem service has 2 kinds of data channels, one, is the memory that you are purchasing for using, and of course this memory is till 1 month validity after which is is invalidated, or this memory have to be used before 1 month, now, there 1 more interesting memory usage, the speed usage, which also get invalidated quickly if we access any memory in the internet that constantly needs high speed, like watching videos beyond a limit, would invalidate the 3 g speed, and the speed drastically reduces, though the left memory is still there and is ready for slow speed usage, of course if we use this speed usage for still picture and texts, then this speed usage gets reduced that the end of the memory usage. So, have you all experiencing this? What are the remedies? Is Air Tel playing unethical? Were we told that this would happen? We were supposed to enjoy 3 G speed for the whole memory we purchase.