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). The electric contacts and circuitry of a micro-SIM are identical ...
4FF stands for 4th Form Factor. A SIM card that is simply physically smaller than a traditional (2FF) SIM card or Micro-SIM (3FF) card. The electric contacts and circuitry of a Nano-SIM are identical ...
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