Mode: IMEI When you enter this number (no need to touch dial afterwards), you should be presented with your 15 digit IMEI number.
IMEI stands for International Mobile Equipment Identity.
In addition to https://, ftp:// protocol identifiers, the i Phone also supports tel://, facetime://, and mailto:// You must have a complete and valid URL (Uniform Resource Locator) for it to work.
Safari will then launch the appropriate application to handle it.
Changing SIM card, you can be tracked by cellphone used.
Location can be narrowed down using IMEI triangulation of cell towers the cellphone is closest to.
The closer this number is to 0, the stronger the cell signal (or the closer you are to a tower).