I just started watching cg and I have few questions

Hey, I just started watching Code Geass and I'm already on episode 9! It's awesome, so I binged a bunch. But I have a few questions because I gotta know everything about a show I'm watching:

  1. How did Lelouch pull off that bathroom phone call? It's like he recorded it, but how did he know when to call?
  2. Through episode 9, Lelouch's dad's the Emperor, but is his mom Japanese or Britannian? Why did she get killed (if that's explained later, don't spoil it)? And was she born Japanese, or did she move there, or what?
  3. Why did that girl in episode 9 (the one Lelouch kissed, the Black Knight member – I forgot her name!) get so emotional about her mom? You'd think she'd stick by her side, but she hated her at first. What changed?

Just answer these if you can, thanks!