[jeet.bhatt@spec-india.com]

how to get incoming call number using Phone API?
would my application autometically invoke when a new call arrives?
what to do to get it invoked autometically when a new call arrives?

[Klotar]

I'm not a programmer, but from what I have seen (of 3rd party applications that I have played with as a user), most apps do this via accessing the phone logs.

Calls aren't logged only after the call has ended, the log entry is created as soon as the phone rings; so this may be an ideal way to do what you want.

As for the rest of your question, can't help there but if the app was running, it could listen for any change to the phone log?