Comment 1 for bug 1389861

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Michael Terry (mterry) wrote : Re: can't unlock phone during an incoming call

This is because we use the same mode as the emergency dialer when an incoming call happens and the user is on the lockscreen.

In emergency dialer mode, we present a very stripped down experience for both no-distraction reasons and avoiding-security-hole reasons -- emergency mode is a kind of controlled exploit because we actually unlock your phone and let you only see your dialer.

Some options to fix this would be to tease apart "incoming call mode" and "emergency dialer mode", which wouldn't be entirely trivial but obviously not impossible. Or maybe add indicators (and launcher?) back to the locked-dialer experience in both cases.

In either case, we would want to lots of testing to make sure you can't break out of the dialer jail.