What is dual sim in the phone?

The term Dual Sim in a phone or smartphone means support for two SIM cards, one of which you can use, for example, for personal calls, and the second for workers. Many modern smartphones support two SIM cards.

It is important to note that there are several types of support for two SIM cards.

Dual SIM Dual Standby (DSDS) or Dual SIM Standby (DSS)

The essence of this technology is that both SIM cards can be in standby mode at the same time, but at the same time making a call is possible only on one of the SIM cards.

What does it look like in practice? A call can arrive on any of the SIM cards, but as soon as you start talking, the second SIM card will automatically become unavailable. If you call her, you will hear a message that the subscriber’s phone is switched off or is out of network coverage.

This technology is not suitable for those users who go to receive several calls simultaneously from different SIM cards. However, you can enable call forwarding support from one SIM card to a second.

Dual SIM Dual Active (DSDA)

This is a more interesting technology, because unlike Dual SIM Dual Standby, it allows you to receive calls simultaneously from two SIM cards. And all because in this case two independent radio modules are used.

This option is more convenient and versatile, but smartphones with Dual SIM Dual Active technology may be slightly more expensive (not in all cases).