What is the 2FF, 3FF, and 4FF form factor?

SIM cards are available in four sizes:  
1FF: 85.6 mm × 53.98 mm × 0.76 mm (no longer used in modern applications)
2FF: 25 mm x 15 mm x 0.76 mm - Mini
3FF: 15 mm x 12 mm x 0.76 mm - Micro
4FF: 12.3 mm x 8.8 mm x 0.67 mm - Nano
The choice of SIM card size (2FF - 4FF) depends entirely on the size of the device. Also available are industrial SIM cards in the 2FF - 4FF form factors that are able to withstand corrosion, vibration and other environmental factors and extreme temperature conditions (-40°C and +105°C).

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