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Our online glossary is here to help you make sense of the terminology used in the cell phone industry. It covers mobile technologies, such as 3G and 4G, and even includes a bit of information on smartphone operating systems and the companies that make the cell phones and other mobile technology devices we all use.

What is "Dual-SIM"?

A Dual-SIM compatible device means that it can carry two SIM cards simultaneously, typically in two different forms. This feature has yet to make a big impact in North America or Europe, but has found increased popularity in Asian markets and is slowly becoming a standard feature.

The first form of Dual-SIM device is a DSS that requires the user to specify which SIM card is the active and which is placed in standby. The second form is DSA which means both SIM cards can work at the same time and both receive calls and perform other tasks.

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