On: The IMEI Code: Your phone’s other number

[harshaxnim]

Can you elaborate on what you meant by trackable when they're "continously in close proximity to you"?

[aspenmayer → harshaxnim]

https://en.wikipedia.org/wiki/IMSI-catcher

[wiml → harshaxnim]

If they can listen to the radio traffic between your phone and the cell tower, that is.

[p_l → harshaxnim]

Snooping, or hijacking, the radio pathway between you and your network operator.