(1) works. In Europe, anyway, where 112 is the standard. And on most mobiles. However 911 is the standard in N. America & 112 isn't recognised everywhere there.
(2) might have worked in some cars a long time ago in a universe far away. However, with RF controlled key which many are nowadays, not a chance.
(3) Nope. It is a valid code for older Nokias, but does something other. In fact, it turns off the 'half-power' mode, and therefore uses your battery faster. (or mostly, at the same rate, as not many people use their phones in 'economy' mode.)
(4) Yes. Often works. Depends on how important your phone service provider thinks security is.
Sorry 'n that
Jim