Logging calls after hanging up on smart phones

Question

In the various smartphone APIs/SDKs, I was wondering if it is possible to prompt a user if they'd like to log a phone call after they hang up. The most basic functionality would be after calling out or receiving a call, the phone would ask

Do you want to log the call to|from 555-555-5555?
Yes | No | Never this number

(then it might take the user to a small form and then post the info to a webservice)

The business use is for lawyers who have company phones and need to track billing.

this is a bit different question than http://stackoverflow.com/questions/341622/accessing-the-iphones-call-log-with-the-iphone-sdk, and I'm curious about blackberries

Thanks

Answer 1

Blackberries have call logging out of the box. Blackberry Enterprise Server activated units sync the log with the server.

Answer 2

On an Android phone you can register a PhoneStateListener to receive a notification of when a call hangs up and log the number by whatever method you wish.

Answer 3

On iPhone, no way.
Apple would have to allow (shudder) background applications.

Note: Shraptnel is right, you may be able to monitor the phone state with some private API's if you jailbroke your phone and ran your program in the background.