1. A method of operating a computer system that is configured to provide downloadable subscription-based software applications across a wireless network, comprising: receiving a subscription-based application download data at the computer system from an application download server corresponding to a download from the application download server to a wireless device of a subscription-based software application; receiving, at the computer system over the wireless network, a subscription-based application deletion data passively transmitted in response to a deletion from the wireless device of a corresponding subscription-based software application; calculating at the computer system a subscription fee associated with a usage of said corresponding subscription-based software application between said download and said deletion; and transmitting said subscription fee from the computer system to a billing module of said computer system.