A dual-SIM setup lets you use one phone to make and receive calls and texts from two numbers. It's also super convenient and can save you serious cash when traveling. We show you how to use two SIMs ...

For the smartphone that does everything, you need a case that does even more. Such as turn your one iPhone into two. Meet the Krimston Two, described as “a 1 phone solution to a 2 SIM card problem.” ...

rSIM is a new SIM tech that lets you pack a backup SIM in your SIM card. It claims to test your device’s connection directly from the SIM itself and switches providers automatically during disruptions ...

Quite a few phones worldwide support the simultaneous use of two physical SIM cards, but not many US models do. In fact, most otherwise dual-SIM-capable phones see the feature disabled in the US ...