Micro-SIM (3FF, Third Form Factor, 15 x 12mm) was introduced for iPhone 4 in 2010 and used in tablets and smartphones from 2010 to 2015 before Nano-SIM became dominant.
| Pin | Name | Function | Type |
|---|---|---|---|
| C1 | VCC | Supply voltage | PWR |
| C2 | RST | Card reset | I/O |
| C3 | CLK | Clock | BUS |
| C5 | GND | Ground | GND |
| C7 | I/O | Data I/O | BUS |