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A dual SIM mobile phone is one which has two Subscriber Identity Modules (SIMs). Dual-SIM adapters are available to allow cellphones to contain two SIMs, and to switch from one to the other as required. Some phones are designed to work with two SIMs, both of which may be active at the same time.Cick here to enter Clone Samsung and Clone iPhone and Brand Cellphone
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
Dual SIM Cellphone
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Several types of adapters are available. All of them allow one SIM to be active, and to receive calls, at any given time; they provide various ways of switching from one SIM to the other. Earlier versions required the phone to be switched off and on again to change from one to another. Later models allow the user to switch SIM cards via a menu or by keying in a numeric code, without switching the phone off.
Mobile phones with simultaneous dual SIM capability built-in have the advantage that there are no possible legal issues, breach of contract, or voiding of warranty. They allow both SIMs to be active simultaneously and allow calls to be received on either number, unlike adapters that make one or other number active as required.
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Normal GSM phones contain a single transceiver; dual-SIM phones must have dual transceivers, and need to display signal strength for both networks. A phone with a single transceiver cannot be converted to simultaneous dual-SIM operation; at most it can be made switchable with the use of an adapter.
Although battery life (talk time and standby time) of dual-SIM phones is reduced, typically by about a third, when both SIMs are active, to compensate this they often came with better capacity batteries compared to single-SIM phones.
