Dual SIM

A dual - SIM phone is a mobile phone that combines two transmitting and receiving devices in a housing to simultaneously on two lines ( SIM cards) to be accessible.

  • 3.1 Several Sende-/Empfangsseinheiten
  • 3.2 Dual sim standby
  • 4.1 True and false MULTI- SIM phones
  • 4.2 Multi- Sim devices and multi- sim contracts
  • 4.3 Multi- SIM adapter

Purpose

There are several reasons to be traveling with more than one mobile connection.

Separation of private and business calls

Probably the most common incentive for a dual - SIM phone is the avoidance of the parallel use of a private and a business mobile phones because private conversations are on the official mobile phone often very limited or not permitted.

Foreign countries

Other useful applications are the additional use of a foreign network card required with frequent or prolonged stay abroad.

Collective sharing

When collective sharing two network cards are used with different strengths, for example, one with unlimited data plan and another for making phone calls.

History

The first precursor of dual SIM mobile phones brought the Finnish manufacturer Benefon the summer of 2000 with the Benefon twin on the market. Although the unit could accommodate two SIM cards, but do not use the same time. The to-use map had to be selected when you turn, a change was possible only by switching off and re-election after re turning. That was probably the reason why the model was not a resounding success and failed to imitators.

In subsequent years, however, so-called dual - SIM adapters were popular, which can accommodate two cards and are connected to the network card slot of the phone. The first such adapters were so large that they were only carried externally on the cell phone, which is why they found only limited distribution. 2003 Dual - SIM adapter came on the market, with which almost any standard phone can be upgraded internally. But with all these adapters is only one alternation between two (or more) SIM cards, but no simultaneous transmit and receive data.

In 2006 began mobile phone manufacturers from China and other Asian countries to take real dual SIM mobile phone ( for simultaneous operation of both cards) on the market. These were first offered only on domestic or Asian market. However, through online trading portals like eBay they were available worldwide. Since the beginning of 2007, they were isolated offered by private providers in Germany and the EU.

On the Hanoverian information technology exhibition CeBIT in March 2007 introduced several Asian manufacturers dual SIM devices. After the Cebit in March 2007 took up the electronics mail order Conrad became the first major German dealer is a dual SIM mobile phone in the assortment on, after repeated postponement of the delivery and model changes are since the beginning of 2008 Equipment available.

The announced from Munich start -up company Bell Pepper in August 2007 dual SIM mobile phone Twin Bell (double bell) with UMTS never came to market.

Since November 2007, Samsung offers the D880 was the first well-known manufacturers of a dual SIM mobile phone. The unit was initially sold only in Asia and Russia, where the Russian version has a German menu. Since March 2008, the unit is also officially sold in Germany. About EU imports has also become the successor of D980 available.

Early 2008 has made the breakthrough the market segment, there are several models of different (mostly no-name ) providers entered the market, some of which are listed by major chains and online consignors.

Currently (2012 ) there are at reasonable prices already a large number of dual SIM mobile phones, both as a smartphone, as well as a simple low-cost device; the Finnish manufacturer Nokia offers the Nokia 101 is a dual - SIM model, which is even available already for about 30 euros.

Models with multiple transceiver units vs. Dual Sim Standby

Dual sim mobile phones are available with one or more transceiver units.

Several Sende-/Empfangsseinheiten

Models with multiple receive parts that are simultaneously active independently of each other and allowing simultaneous connections on both SIM cards are on the second SIM card can be achieved even when it is busy on the phone on the other or data transmission takes place, both Call Waiting from the second SIM card, as well as telephone conferences on both SIM cards are made ​​possible.

Dual sim standby

Models that have only one transceiver, can be produced cheaper and charge the battery of the respective mobile phone less. In this technique, the mobile phone registers in both networks and can also be reached in two. However, once the SIM card is a call, the other while being not accessible. After the active use was stopped, both SIM cards are available again.

Models with more than two SIM cards

True and false MULTI- SIM phones

The accommodation of more than two SIM cards in one device is technically no problem. However, in this until around 2010 mostly manufactured in Asia devices, often only two SIM cards simultaneously operational (non-genuine 3 - or 4-SIM-Handys/TRI- or QUAD- SIM phones ). Since about 2011 there TRI-SIM-Handys/TRI-SIM-Smartphones (three different SIM cards) or QUAD-SIM-Handys/QUAD-SIM-Smartphones (four different SIM cards) that the parallel simultaneous use of all allow the appliance while operators cards ( SIM cards) (eg, the Chinese touchscreen phone L913 - four cards). These handsets are then true 3 - or 4-SIM-Handys/-Smartphones. This MULTI-SIM-Handys/-Smartphones are available through distributors in Germany.

Multi- Sim devices and multi- sim contracts

Multi- SIM devices are not to be confused with multi- sim contracts. For multi - sim contracts ( TRICARD, Twin Card, SIM Card Duo) several SIM cards to a phone number ( a single provider ) can be used on multiple devices simultaneously. For multi - SIM devices SIM cards with several different telephone numbers are used ( from two different providers ) in one unit.

Multi- SIM adapter

Some devices are also suitable for installation of additional Multi- SIM adapters so that the device can be added and managed three or four cards. At the same time send and ready to receive data are only two.

Problems at launch

Many mobile phone provider attempt (ed) to bind their clients exclusively in itself, such as through run-time contracts or binding of a subsidized mobile phones to a network card by so-called SIM lock. They had no interest in their customers to sell dual- SIM mobile phones - they allow the simultaneous and selective use of quotations from different vendors (and also the use of several networks, such as e- network and D-net ). Since many tariffs represent a mixed calculation of relatively low and relatively expensive types of use, these providers have an interest in ensuring that all customers - make uses the same rate - even the expensive ones. Earlier, when the mobile phones were much more expensive than it is today (2013 ), there was a subsidy policy in the mobile market; Equipment manufacturers, dealers and mobile phone providers had some similar interests; the provider had a high market power.

These facts could not prevent the entry of dual- SIM phones. In the spring of 2008 came a dozen different devices, some from reputable dealers on the German and European market.

Manufacturer (models)

  • Alcatel
  • HTC ( Desire V, 600 Desire, Desire SV)
  • General Mobile ( DST11, DSTW1, DSTL1 )
  • Nokia ( carphone 6090, C1 -00, C2 -00, C2 -03, C2 -06, 101, 112, X2 -02, 205, 206, 501, 515)
  • LG ( KS660, Optimus Net P698 )
  • Samsung ( D780 Dual, Dual D880, D980 Dual, B5702, B5722, C5212, C6112, B7722, S6802, S6102, S7562, C3322 )
  • CECT ( E2296, 599, 599 , T828 , D998, K800 )
  • Matsunichi ( D520, D620 )
  • Emporia Telecom ( Dual Sim )
  • Hyundai (MB- D130, MB - D125, MB -D 5330 )
  • Anycool ( D66 , Emgeton Noble 3G, F818, T808 )
  • Yulong ( Coolpad 8166, Coolpad 728G2 )
  • Acer ( DX900, Liquid Duo E1, E2 Duo Liquid, Liquid S1 Duo, Duo Liquid Z3, Z5 Liquid Duo)
  • Hagenuk ( Fono DS 300)
  • Allview (F1 X-perience, T1 Vision, Fusion M1, M4 Slim, S2 Guld, E1 Tickle, G1 Magic, M2i Chroma, M3 synchro, S1i Tytan )
  • Mobistel ( EL400, EL560 different colors, EL600 different colors, Cynus T1, T2 Cynus, Cynus T5, T7 Cynus )
  • Limex (Dual 4.0)
  • ViewSonic ( V350 )
  • Gigabyte Technology ( G1310, G1315, G1317D )
  • Mustang Electronics ( Mustang PHONEM1B -R mobile phone M31 )
  • Sony ( Xperia tipo dual)
  • Caterpillar (CAT B10, B15 CAT )
  • Fair Phone
Twig Com Alcatel Mobile Phones Qiao Xing Caterpillar Inc. Fairphone Alternate Line Service
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