What are SIM card readers, writers and SIM copying devices?

Question

I need any information regarding the use and functionality of these device/s

Answer 1

SIM card readers are generally used to back up your data. Certain Networks' SIMs are security embedded so you cannot transfer your contacts from one handset to another easily. Therefore SIM card readers are perfect for this. Some use Excel format and you simply plug the device into a USB port and it saves a file of names and numbers for you to use as back up. You can edit the file and if you have more than 1 phone you can keep a record just in case you lose or damage your SIM in the future. It is best practise to buy one (they are about £10, $20) and at least this way, if your handset plays up and has to be re-flashed then your numbers will be safe.

Answer 2

Cell phones use SIM cards to carry information required to make and receive calls as well as storing information about the phone and it's signals.

Readers do what they say, the read the info on a SIM card, writers write it, and copiers copy it.

It may be a work of fiction, but watch the movie "The Bourne Supremacy" there is a scene in which the character uses SIM reading and copying devices to listen in on a cel phone conversations. It might just be a movie, but with the right equipment, you can do what he does with the SIM card.