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3FF stands for 3rd Form Factor.

A SIM card that is physically smaller than a traditional (2FF) SIM, but larger than a nano-SIM (4FF).

See: SIM

The electric contacts and circuitry of a micro-SIM are identical to that of a larger SIM card; the plastic part is simply smaller. A micro-SIM can be used in a larger SIM card slot with an adapter.

See: Nano-SIM

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