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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 both network connections at once.
Dual SIM phones are mainstream in many countries where phones are normally sold unlocked. Dual SIMs are popular for separating personal and business calls, in locations where lower prices apply to calls between clients of the same provider, where a single network may lack comprehensive coverage, and for travel across national and regional borders. In countries where dual SIM phones are the norm, people who require only one SIM leave the second SIM slot empty. Dual SIM phones usually have two unique IMEI numbers, one for each SIM slot.
Devices that use more than two SIM cards have also been developed and released, notably the LG A290 triple SIM phone, and even handsets that support four SIMs, such as the Cherry Mobile Quad Q70.
The first phone to include dual SIM functionality was the Benefon Twin, released by Benefon in 2000. 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.
Such phones were initially eschewed by major manufacturers due to potential pressure from telecommunications companies, but from about 2010 Nokia, Samsung, Sony and several others followed suit, with the Nokia C2-00, Nokia C1-00 and Nokia C2-03 and most notably the Nokia X, phones from Samsung's Duos series, and the Sony Xperia Z3 Dual, Sony Xperia C and tipo dual. Apple added dual SIM support in its 2018 iPhone XS models, with models sold in China containing two physical SIM slots, and models sold elsewhere supporting dual SIM by means of (Embedded) eSIM alongside a single physical SIM.
For originating communications via the mobile phone network, the way to choose which SIM is used may vary on different phones. For example, one can be selected as primary or default for making calls, and one (which could be the same one) for data. Apple phones supporting dual SIMs can be set up to automatically use a specific SIM for each contact or the same one used for the last call to the contact, for iMessage, and for FaceTime. Typically when dialling or sending a message an option to select a SIM is displayed.
Prior to the introduction of dual SIM phones, adapters that fit in the SIM card slot and hold two SIMs, with provision to switch between them when required.
In dual SIM switch phones, such as the Nokia C1-00, only one SIM, selected by the user, is active at any time; it is not possible to receive or make calls on the inactive SIM.
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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 both network connections at once.
Dual SIM phones are mainstream in many countries where phones are normally sold unlocked. Dual SIMs are popular for separating personal and business calls, in locations where lower prices apply to calls between clients of the same provider, where a single network may lack comprehensive coverage, and for travel across national and regional borders. In countries where dual SIM phones are the norm, people who require only one SIM leave the second SIM slot empty. Dual SIM phones usually have two unique IMEI numbers, one for each SIM slot.
Devices that use more than two SIM cards have also been developed and released, notably the LG A290 triple SIM phone, and even handsets that support four SIMs, such as the Cherry Mobile Quad Q70.
The first phone to include dual SIM functionality was the Benefon Twin, released by Benefon in 2000. 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.
Such phones were initially eschewed by major manufacturers due to potential pressure from telecommunications companies, but from about 2010 Nokia, Samsung, Sony and several others followed suit, with the Nokia C2-00, Nokia C1-00 and Nokia C2-03 and most notably the Nokia X, phones from Samsung's Duos series, and the Sony Xperia Z3 Dual, Sony Xperia C and tipo dual. Apple added dual SIM support in its 2018 iPhone XS models, with models sold in China containing two physical SIM slots, and models sold elsewhere supporting dual SIM by means of (Embedded) eSIM alongside a single physical SIM.
For originating communications via the mobile phone network, the way to choose which SIM is used may vary on different phones. For example, one can be selected as primary or default for making calls, and one (which could be the same one) for data. Apple phones supporting dual SIMs can be set up to automatically use a specific SIM for each contact or the same one used for the last call to the contact, for iMessage, and for FaceTime. Typically when dialling or sending a message an option to select a SIM is displayed.
Prior to the introduction of dual SIM phones, adapters that fit in the SIM card slot and hold two SIMs, with provision to switch between them when required.
In dual SIM switch phones, such as the Nokia C1-00, only one SIM, selected by the user, is active at any time; it is not possible to receive or make calls on the inactive SIM.