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The first phone to include dual SIM functionality was the Benefon Twin, released by Benefon in 2000. [7] More dual SIM phones were introduced in about 2007, most of them coming from small Chinese firms producing phones using Mediatek systems-on-a-chip. They started to attract mainstream attention. [8] [9]
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).
A dual-mode phone is a telephone which uses more than one technique for sending and receiving voice and data. This could be for wireless mobile phones or for wired phones. There are three types of dual-mode phones.
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. E.g., to voicemail. This is the default behaviour, and it is what happens if “Dual SIM Always On” is set to "Offline". Setting “Dual SIM Always On” allows a call on one SIM to interrupt a call on the other SIM.
Opening a second app in split screen view doesn’t automatically resize the first app to display on half the screen, though. The first app kind of scoots over, and your view of it is cut off. You can work around this in settings by dictating how each individual app should display on the main screen — in 16:9, 4:3, or full screen.
The phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.
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Key pad of a Nokia 3720. Besides the number keypad and buttons for accepting and declining calls (typically from left to right and coloured green and red respectively), button mobile phones commonly feature two option keys, one to the left and one to the right, and a four-directional D-pad which may feature a center button which acts in resemblance to an "Enter" and "OK" button.