Usage data App for iPhone

The application is pretty simple, its main functionality is to calculate the amount of time spent talking on the phone for incoming or outgoing calls, save that in some local storage before transferring it back to a web service. The full application has several other features that depends on this data, but for the pilot all the required functionality are as follow: The Application Should: - Stay alive and active as a service in the phone memory. - Whenever a call starts the application should capture : caller/called number, call start date and time, roaming status of the current phone (which has the application installed on) and save that in some storage (DB table maybe?) - Whenever a call is ended the application should capture: caller/called number, call end date and time, roaming status of the current phone (which has the application installed on) and save that in some storage (DB table maybe?). - The application should calculate the amount of used Internet data every month. The application should NOT: 1. Require Jailbreaking 2. Violate the use of Apple's regulations 3. Drain the battery