What is the difference between a SIM card and a USIM card

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A SIM card supports only 2G services. A USIM card supports both 2G and 3G services.

Other related questions:
What is the difference between the SIM and USIM cards
The SIM card supports only the 2G services, while the USIM card supports both 2G and 3G services.

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.

Does the UIM/SIM card of a 3G data card support hot swap
The UIM/SIM card of a 3G data card (3G modem) does not support hot swap. However,3G data cards support hot swap.

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.

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