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A dual-SIM phone.
More recently, some phones have been produced that can natively work with two SIMs, both of which may be active at the same time. These are active dual-SIM phones. There are also some Chinese triple-SIM phones.[1] Akai Trio is the first phone with triple GSM SIM slots [2]
Dual-SIM operation allows the use of two services without the need to carry two phones at the same time. For example, the same handset can be used for business and private use with separate numbers and bills; or for travel, with an additional SIM for the country visited. Using multiple SIM cards allows the user to take advantage of different pricing plans for calls and text messages to certain destinations as well as mobile data usage.
These phones have until recent years been largely eschewed by the larger phone manufacturers partly due to their close ties with mobile phone networks who would prefer that customers use only one network exclusively. However more recently manufacturers such as Nokia and Samsung have started producing these phones, which will target customers mostly from developing countries.[3][4]Contents [hide]
1 Types
2 Chinese Dual SIM Phones
3 Active dual-SIM phones
4 See also
5 References
6 External links
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Types
«Pseudo-Dual» - for convenient to use second SIM (as rule, it has «no major» slot for this) without both SIMs connected with owns mobile service providers (MSP).
«Dual Sim Shift»
«Dual Sim Standby» (DSS) - both SIMs connected with owns MSPs at the same time & if one number (SIM) is busy, then other not reachable for dial
«Dual Sim Active» - same as «DSS», but «no active SIM» is reachable for dial by user command at same moment of time, when other SIM in «dialing mode» (it's using transceiver).
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Chinese Dual SIM Phones
There are many dual SIM phones now available from the Chinese market. The phones, which also usually include touch screen interfaces and other modern features, typically retail for a much lower price than branded models. Due to the extra battery usage of the additional sim slot the phones are usually supplied with two battery packs. Popular in Asia, these inexpensive dual SIM mobile phones are now also becoming available to buy directly from Europe, with reports that both slots are compatible with the majority of the major EU mobile networks.
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Active dual-SIM phones
Mobile phones with built-in simultaneous dual SIM capability allow both SIMs to be active simultaneously and allow calls to be received on either number at any given time. Most such phones have two transceivers built in one of which may support 2G and 3G while another may only support 2G.
Though a new generation of Dual SIM Phones, called "Dual SIM Dual Standby" (DSDS) provide the ability to have 2 active SIM simultaneously, using only one transceiver. This is for example technology used in M158 Slider Touch & Type Dual SIM Mobile Phone, K-Touch A982, LG-GX200, Philips Xenium - X100, Samsung B7722, Samsung B5722 and Samsung E2152.
Although battery life (talk time and standby time) of active dual-SIM mobile phones is reduced — typically by about a third[citation needed] — when both SIMs are active, to compensate this they often came with better capacity batteries, or in the case of Chinese-made phones, bundle their units with two batteries, compared to single-SIM phones.
In November 2007, Verzio — a Singapore-based 3C (computing, communications, consumer electronics) brand launched the world's first 3G Dual-Triband dual-SIM model named Duplii. The same brand also launched the Twinn, 2.75G dual-SIM model. Powered by 2 processors, the Duplii and Twinn provide real dual-SIM real dual-connecting capability.
There are some little-known Chinese companies supplying inexpensive dual-SIM mobiles, mainly in Asian countries. The latest models includes W006- Dual SIM & Dual IMEI Mobile Phone, The M60 - Quadband Dual SIM Touchscreen mobile phone was launched in April 2010 being the 1st of the Chinese touch screen only mobiles with no keypad, including many features WiFi, Dual IMEI, Media playback & camera ect to rival normal mobile phones.
Philips has made models Xenium 9@9w and 699 with this capability belonging to the restart to change active-line generation. Samsung also released the D880 DuoS in November 2007, a slider which can hold two SIM cards with simultaneous standby and the D780 which came much later both have limited function on the 2nd sim card, and there is a Windows Mobile based dual-sim phone too, called E-TEN glofiish DX900 (released in November 2008, been renamed to Acer Tempo DX900 in January 2009, after Acer bought E-TEN).
Popular Indian mobile companies such as Karbonn Mobiles, Micromax Mobile, Spice, Lemon Mobiles, LAVA Mobiles launch many feature phones with Dual SIM technology. Even few smart phones from these companies are Dual SIM based.
Nokia has now launched two dual SIM phone models C2-00 and X1-01. Both are 2G phones.
