What is the difference between the SIM and USIM cards

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The SIM card supports only the 2G services, while the USIM card supports both 2G and 3G services.

Other related questions:
What is the difference between a SIM card and a USIM card
A SIM card supports only 2G services. A USIM card supports both 2G and 3G services.

What are the differences between the two micro SD cards on the AR2200 and AR3200
Each AR2200 or AR3200 supports two micro SD cards, a built-in micro SD card sd1 and an external micro SD card sd0. The two micro SD cards are the same except that logs are saved on sd1 default.

Differences between MELLANOX QDR 40 GB/s IB cards and FDR 56 GB/s IB cards
QDR 40 GB/s IB cards and FDR 56 GB/s IB cards provide different transmission rates.

What are the differences between the two Micro SD cards installed on AR2200 and AR3200 series routers
Solution: AR2200 and AR3200 series support two Micro SD cards, in which the built-in Micro SD card is named sd1, and the Micro SD card installed by the user is named sd0. The functions of the two Micro SD cards are same except that logs generated by the device are stored on sd1 by default.

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