What is 4FF and 3FF in SIM? 0

3FF is also called Microsim. It is most commonly used in mobile devices. The microsim was introduced in 2003. This form is called Third Form factor or 3FF.

Various SIM cards are,

First Form – Credit Card Sized cards

Second Form – Stamp Sized SIM cards

Third Form – microSIM

Now ETSI accepted new standard named nano sim which is also called 4FF or forth Form Factor. 3FF has a dimension of 12mm x 15mm.

Various Sim sizes and dimensions are showed in the image shown above.