Phil for Humanity Phil for Humanity
A Guide for the Survival of Humankind and Helping the World, Society, and Yourself.



Merge SIM and SD Cards


My cell phone has both a SIM card and a Micro SD card. I always wondered why my phone needed both types of cards, when a single card could probably do the job of both, as well as probably save both consumers and cell phone manufacturers some money in the process.

So, I did a little research. SD cards are primarily used for user storage, such as photos, videos, and music. While SIM cards are used for identification purposes (to easily port phone numbers from one phone to another), list compatible mobile networks, and limited user contact information.


Since SD cards are substantial larger in memory, it is obvious that they would be the best option to remain if removing one of the cards (and card readers) from phones. However, SD cards would also need to also store SIM card data in a separate secure section of memory, where users are not able to directly edit this data, unlike files typically stored on SD cards. The rest of the memory would still be accessible to users as a normal SD card.

As a result, entire contact lists and all of the information listed in each contact would be save-able onto these SD cards, unlike SIM card that only stores names and up to 3 phone numbers. SIM cards do not store email addresses, addresses, notes, and even emergency contact information, such as, allergies, medications, hospitals, doctors, travel plans, etc.

The benefit to consumers is that people no longer need to purchase both a SIM and SD card, and would only need to purchase a single card. The benefit to manufacturers is only a single card reader would be necessary in each device thereby reducing costs.

I think this idea is an obvious progression to current technology. However, I just wonder why it has not been implemented already.

by Phil for Humanity
on 08/07/2014

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