“Back when we traveled, my family members all just bought different SIM cards,” said Paige Hanson, chief of cyber safety education at NortonLifeLock. All of the data and applications on the physical device would still be accessible, and once the user returns from the trip, the original SIM card can be switched back. Instead of paying high international rates through a home-country phone provider or getting a completely new phone, a traveler can purchase another SIM card from a carrier that operates within the destination area for a low price. Having an identifying card that is separate from the mobile device has its advantages, such as when a phone user travels abroad. Switching Out SIM Cards Is Convenient for Travel More on Hardware How Dust Identity’s Technology Protects Supply Chains From Tampering The current size - the nano SIM - is only the size of the circuit printed on the card, and it stores the identifier code of the phone’s account user on its programmable memory, which holds between 16 and 256 KB of data. According to InfoSec Institute, a technology training company, the original SIM card was the size of a credit card, but the cards have been steadily shrinking since appearing on the market in 1991. The cards themselves are simple plastic pieces with chips on them, similar to those found in credit cards and hotel key cards. SIM cards allow phones to send and receive calls and messages, and help providers accurately track billing for their customers. The cards themselves are similar to credit cards and hotel key cards, with integrated circuits printed on them. SIM cards store information that help mobile service providers associate physical mobile devices with individual customer accounts.

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