One more reason to stay with BlackBerry:
Blackberry password wipe.
Ruling lets California police search your phone without a warrant - CNN.com
I'll set my phone to wipe after three attempts if I travel to California. (Hopefully I won't.)
If confronted with a demand to unlock my phone (even by a judge), I would also raise other constitutional issues [like the right to be free from involuntary servitude (i.e. slavery)] in addition to the usual Fourth amendment search and seizure issues. No citizen can be compelled to enter keystrokes for the police! I don't work for them, therefore I won't enter keystrokes!