A hardware and/or software facility measures end user activity associated with a software application or service on a mobile phone or other mobile device. The facility tracks and stores usage data associated with a mobile user's use of the application or service. When the mobile user initiates transmission of the usage data, the facility retrieves from the mobile phone or other mobile device a usage code representing the usage data. The facility relies on user transcription, text input-buffer insertion, or other indirect means of data transport to deliver the usage code from the mobile phone or other mobile device to an application developer, service provider, or another entity. The recipient extracts the usage data contained in the usage code, and may perform various data mining and analysis techniques on the usage data in order to evaluate how the application or service is used.