Dual SIM refers to the ability to use two SIM cards in a single smartphone.
To use dual SIM, you need a smartphone that supports dual SIMs. Also, it may not be available depending on the combination of smartphone and mobile carrier.
Normally, a smartphone uses one SIM card, but a dual SIM smartphone allows you to insert two SIM cards, enabling you to use two different phone numbers or different LINE accounts, essentially giving you the feeling of having two smartphones in one device.
There are two types of SIM cards: “physical SIMs,” which are physical IC cards, and “eSIMs,” which are IC chips embedded in the smartphone that allow the user to rewrite the data. These are IC cards that record unique IDs and other information necessary for making calls and using data communication on smartphones and tablets. Because they contain phone number information and encryption algorithms, one phone number can be used per SIM. There are different types of dual SIMs, such as “DSDA,” “DSDV,” “DSDS,” and “DSSS,” and the available functions vary depending on the type (method) supported by the product.
Dual-SIM smartphones generally have two slots for inserting IC cards (SIM cards) that contain contract information with mobile phone carriers. However, some dual-SIM smartphones use eSIMs, and the way SIM cards are combined varies depending on the smartphone.
The advantages of dual-SIM include the following:
