At 25mm x 15mm x 0.76, it is 3.4 times larger than today's current SIM cards, which offer the same features in a much more compact package. Most people, however, are more familiar with the 2FF SIM card, known more readily as the Regular SIM card. Designated as 4FF, or fourth form factor, it measures 12.3mm x 8.8mm x 0.67mm, a reduction of over 42 times from the SIM's inception. The nano SIM is the SIM card's fourth size standard since its inception. While they have maintained a relative thickness of just under 1mm, their surface area has steadily decreased, from the credit card-sized plates used in the earliest cellphones to the nano SIMs of today's devices. SIM cards have evolved a lot over the years.
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