SIM IS ONE KIND OF NETWORK!!!
<font size=6><font color=#00004D>SIM(SUBSCRIBER IDENTITY MODULE)</font>
It is used to identify a subscriber on mobile telephony devices. it allows user to change phones by simply removing the sim card from one mobile and inserting it into another mobile phone.
Normal size=width 25 mm
Height 15 mm
Thick ness .76 mm
Interfacing refers to the ability or capacity of two objects or items to be brought together to form a function together or a surface forming a common boundary between two adjacent regions, forms, bodies, etc.