- number of smses sent
- number of mms sent
The above two you may
be able to get by traversing the mail folders, play with the Mail api classes
I've not tried this but theoretically possible - how long user was talkig
you might be able to follow along noting the specific answer / disconnect methods found here in the phone listener - how much user has payed for the talk/sms/mms-basing on user's tariif; is it possible to get programatically user's tariff?