A Dual SIM device has 2 (or more) SIMs.
- Device manufacturers determine how many and what type of SIM a mobile device can have (e.g., 2 SIM cards, or 2 eSIM's, or 1 SIM Card and 1 eSIM).
- Some new smartphones can store up to 8 eSIMs.
Important: If you want a Dual SIM smartphone that can have 2 active plans/numbers at the same time, it must also be Dual SIM/Dual Standby (DSDS). Without DSDS, a mobile device may be equipped to store multiple eSIMs, but it can only have one of them activated with a carrier at a time.