Science and technology have advanced to such unbelievable extents that you can come across mobile phones that can use two SIM cards simultaneously. Gone are the days when you could use just only use a single SIM card per mobile. Most of these dual SIM phones are manufactured in China.

The term dual SIM implies that a mobile phone can accommodate two SIM cards inside and that too with totally different numbers and from diverse networks. Great news is that both these numbers of the dual SIM can be contacted simultaneously which implies that you can receive or make calls from both numbers whenever you want. You just need to press a button or select the other SIM number from the Menu in order to switch from one SIM card to the other. Some devices come with pick up or put down buttons to make it easy for the customer to choose which SIM he wants in order to call somebody.

Most of these dual SIM phones comprise of two CPUs that enable the device to make two calls simultaneously and the device has the capacity to accept signals from both these numbers. But you can also come across dual SIM phones that do not have this facility. Such phones comprise of call secretary software or the carrier will comprise of an online call secretary service that transfers the second call to the voice mail if you are busy on the other line. If none of these facilities are available on your device, then the caller will just be informed that you are busy.

The main advantages of using a dual SIM card are to overcome coverage problems that crop up in some areas which imply that you can switch over to your dual SIM that may have coverage in a particular area while the other card may not have net work connection here. Hence the chances of being not reachable are made remote.

Another great plus point is that you can utilize the excellent offers and deals that are offered by two diverse companies and thus utilize the economic aspects of each network.

Convenience is yet another aspect that features high in the case of dual SIM phone mobiles. You can allot one number for personal use and use the other number for receiving only official calls which make it extremely convenient for the user. Since both numbers share the same contact list and SMS inbox that makes identifying contacts simple and systematic.