16 in1 Card.
This is for the one who have many mobile phones and connections, May be from a compny or from many providers or from many countries. Special SIM card can take up to 16 Mobile numbers inside of it.
This give you the oppturnity to download and edit your SIM card's phone book's stored numbers ,SMS messages and to change the PIN codes, and there are more facilities too available. You can change Networks with just some clicks.