How does dual SIM work?

- Dual cards can support two SIM cards at the same time, e.g. SIM cards of two same or DIFF operators.
- Dual SIM means that two phone numbers can be used in a phone at the same time.
- Dual SIM Dual Standby means that the two phone numbers can be in Standby Mode at the same time, but cannot perform Call or Data Access at the same time.