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SIM cards come in various data capacities, from 8 KB to at least 256 KB. All allow a maximum of 250 contacts to be stored on the SIM,

Is it possible to save data (other then contacts) in sim card, interfacing it with micro-controller then transfer data from micro-controller to sim card?

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    \$\begingroup\$ May I ask why? There are much more appropriate and easy to work with media types. \$\endgroup\$
    – Eugene Sh.
    Commented May 10, 2017 at 14:07
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    \$\begingroup\$ Spot on @EugeneSh - OP, please can you expand your question to give all the background details? \$\endgroup\$
    – TonyM
    Commented May 10, 2017 at 14:39

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Absolutely. Except I am not sure if you are referring to smart cards or mobile specific SIM cards.

Smart Cards are easy. They are like any other memory device.

If you need to access a SIM card from a mobile phone it can get a bit more difficult as it becomes carrier and phone vendor specific.

For mobile SIM cards, I found it easiest to use a GMS modem module. You can use the serial port of the µController to communicate with the GSM module.

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