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Dual SIM cell phones allow you to use two SIM cards. Beginning has been made of the dual SIM adapters that worked with the normal cell and allowed to use two SIM, switch between them depending on your needs.

This combination is known as dual SIM standby phones. More recently, cellular products have been able to use two SIM cards working simultaneously; dual SIM phones are called active. There are also Chinese mobile triple SIM. The phones allow you to simultaneously manage dual SIM 2 phone numbers without having to carry two phones. For example, the same phone can be used for personal calls and for those working with separate headings and tariff plans. Or, during a trip, you can use a SIM in your country and one of the countries you are visiting.

Dual SIM Standby Phones

There is many types of adapters. All allow you to keep active and receive calls on a single SIM at a time and offer various ways to switch from one SIM to another. Early versions required to turn off your cell phone and on again, to switch from one SIM to another. The newer models allow users to decide which enabled SIM via a menu or by entering a numeric code, without having to power down the phone.

Some adapters require you to cut the SIM card, so they can be placed on an appropriate support for inclusion in the cell, and the work can be quite dangerous, since there is a risk of damaging the SIM during the process. Other adapters require no cutting or change the SIM card. The adapter has two spaces for the SIM card and a small cable connected to a PCB that has the form of another SIM card. Because of the added circuitry, adapters for some older models like the Nokia 3210 and Nokia 3310, often require larger cover. The newer models are less bulky and have miniature components.

Why use

The possibility of using two SIM card in a mobile option is becoming increasingly required. Use the same phone for personal calls and work, save by combining two different plans or telephone service providers, use local prepaid cards while traveling – are all examples of why can be an attractive dual SIM mobile phone. No need to carry two phones with you every time you leave: the producers have found ever more ingenious ways to solve this problem. Support dual SIM was the forerunner, dual SIM adapters are followed shortly after.

Obviously did not represent a definitive solution, because they were launched dual SIM phones. The major mobile phone manufacturers do not seem interested in this field, or seek to avoid potential pressure, but small producers are investing in this market. There were also attempts to resolve the problem by using software instead of hardware components, such as systems to forward calls.

Support Dual SIM

The first solution is a simple support for dual SIM, which allows you to connect two SIM card slot. And the cheapest option, but certainly does not solve the problem. The main shortcoming of this system is that the two SIM cards do not work simultaneously. While one of two SIM working the other, referred to as SIM ghost, is not usable. The user to switch from one SIM to another must restart the phone.

Is not a much more advanced to keep the second SIM in your wallet and insert it when needed. Only saves the trouble of removing the cover and battery, speeding the operation of several seconds or minutes, depending on which phone model you have and how long it takes to turn off and on.

The other big drawback is the size of the media. Larger than a normal SIM, it is not used with some models. In conclusion, this solution is applicable only if you use the second SIM card rarely.

Dual SIM Adapter

In principle, the adapters are not very different from the media, since they work much the same way. The main difference is that the dual SIM adapter has the same size as a normal SIM card, so there is a problem put it in phone. On the other hand, insert two SIM module can be complicated, since you have to extract the SIM chip from their plastic wrappers and place them into the adapter. Cut the SIM card entails a certain risk. Fortunately, most vendors can perform this process for you after the purchase. Some recent models allow you to switch from one SIM to another without powering down the phone, through the “switch SIM” that appears in the menu of the phone. However, even this system allows you to use two SIM cards simultaneously. The other problem for anyone who thinks stand or adapter is that neither option works on a locked phone, unless both the SIM is not the same operator.

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