Some manufacturers still choose to use the micro SIM format which, at 15mm x 12mm, is only slightly larger than the nano SIM. 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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