any cell phone that is ON can be located by triangulation between 3 cell towers.
all you have to do is turn the phone OFF. when OFF, it cannot be traced. when the phone is off, it does not communicate with cell towers and cannot be found.
the sim card is inside the battery compartment.
if you destroy the card, the phone will not work.
pre-paid cell phones cannot be traced back to the user, but can be located.
if the phone is OFF, it cannot be traced. period.
if you call 911 on a cell phone, the police will instantly have the name and number of the person the phone is registered to (caller ID), but would have to determine the location of the phone at the time of the call from cell phone company records.
the sim card is only a piece of equipment that allows your phone to communicate with cell towers so you can send and receive calls. when ON, the cell phone constantly communicates with cell towers, looking for the best reception.
when the phone is off, everything is dead. removing the sim card and battery accomplish nothing. off is off.
your answer is stated above.
when you call 911, they have your information from caller ID.
the cell phone company can turn your phone back on, unless you remove the battery immediately afterward, but the police still have your name and number from the caller ID.
don't call 911 from a cell phone if you don't want the police to be able to identify you.
you should always assume law enforcement agencies have the ability to identify blocked cell callers.
again....if you don't want to be identified, don't call 911 on your cell phone.