Standby dual SIM phones

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A dual SIM phone has room for 2 SIM cards. That's useful in different situations, for example when you want to keep your work and private life separate. There's a difference between active dual SIM and standby dual SIM. Most dual SIM devices are the standby type. These devices only have 1 antenna. If you use one of the 2 SIM cards, you can't be reached on the other SIM card. When you're not making a call, you can still be reached on both SIM cards.