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2. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support for keeping both connections in a "standby" state for automatic switching, or have two transceivers to maintain ...

3. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

4. Motorola StarTAC - Wikipedia

   en.wikipedia.org/wiki/Motorola_StarTAC

   The phone will request an unlock code if a non-Orange SIM card is inserted. In its original state, these phones can only work if one still has an active Orange SIM card. However, if unlocked both these models will function on the EE network (either directly or via an MVNO on EE's network).

5. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   A nano sim used in mobile phones. One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.

6. Samsung Galaxy Duos - Wikipedia

   en.wikipedia.org/wiki/Samsung_Galaxy_Duos

   Each SIM card in a Samsung dual SIM phone can be set to on or off independently in the top section of the SIM card Manager menu. When both are set to ON, then both can connect incoming calls, but only one at a time. If SIM 2 is in use, a caller to SIM 2 will be redirected by the carrier network as though the phone were off or out of range.

7. Samsung Galaxy Core - Wikipedia

   en.wikipedia.org/wiki/Samsung_Galaxy_Core

   Samsung Galaxy Core GT-I8260 single sim card slot model and Samsung Galaxy Core GT-I8262 dual sim card variant are smartphones manufactured by Samsung Electronics that run on the open source Android 4.1.2 Jelly Bean operating system.