One thing to note is that Flash Lite application get paused when send to background which means it doesnt response to any request when it is in background.However, only few of the platform services of flash lite can run in background, read here :
Service Object in Flash Lite
What kind of call and information ? Flash lite only understand requests via xml socket or in return of a http request.
I dont think there is any alternative or relative API in flash lite to these callback functions.
However, if u r a j2me person then u can find this project interesting "
SWFxME" .
Best Regards,
SajiSoft