The device is compatible with <b>mini-SIM (2FF)</b> size cards. But since different types of SIM cards have the same contact arrangement, smaller SIM cards can also be used with the router, provided they are inserted into a <b>2FF SIM card adapter</b>. A size perspective of the most popular SIM card types can be seen in the figure below:
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[[File:Sim card types v3.png|570px]]
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<b>Micro-SIM (3FF)</b> cards can be used with a 3FF to 2FF SIM card adapter such as this one:
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[[File:3ff to 2ff sim card adapter v2.png]]
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<b>Nano-SIM (4FF)</b> cards can be used with a 4FF to 2FF SIM card adapter such as this one:
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[[File:4ff to 2ff sim card adapter v2.png]]
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The measurements of the different SIM card types are as follows: