alexdonnini wrote:
> Based on my limited understanding (I could be wrong),
> Line2 actually manages calls either via AT&T or the Internet (VOIP),
> i.e. works alongside/replaces the iPhone phone application.

It does not replace the iPhone phone application. It is just another
application on the iPhone. Just like Fring, etc. on Android. Watch
Line2's video on their home page and show me where they "replace" the
iPhone phone application:

http://www.line2.com/

> With regards to the security/permission barriers I refer to below,
> please refer to any attempt to access phone application related
> functions. Have you tried to do that in an application? If you have,
> which ones did you try to use? I am very interested in gaining a
> better understanding of how one could use phone application functions
> in one's own application (just like Line2 does on the iPhone).

You don't need any of that to implement Line2, just as Line2 did not
need any of that to implement their iPhone app.

alexdonnini wrote:
> Again, based on my limited
> understanding, Line2 is not just a VOIP application.

Yes, it is. In fact, they even say they are VOIP on their comparison page:

http://www.line2.com/voip-cell-comparison.aspx

In the video, they are very careful to distinguish between calls they
handle (over 3G/WiFi) and calls the iPhone handles (cellular voice).

> It actually
> performs phone app functions and can let users pamek calls over the
> AT&T network, but I could be wrong.

As AT&T 3G data calls using VOIP, yes, it does.

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy

Android Consulting: http://commonsware.com/consulting

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