Today, we will briefly introduce the development of mobile phone in term of SIM card. Single SIM mobile phone is the pioneer and dual SIM phone being a revolutionary.
1. The Primary Mobile Phone: Single SIM Card
Single SIM sim mobile phone , as the literal meaning refers, are those phones that come with only one SIM card slot so that you can only insert one SIM card in the phone. If you want to own two SIM cards, you have to carry with two handsets. Therefore, it is inconvenient to you, whether you are traveling outsides, or doing business trip abroad. More and more people are going to consider carrying with two SIM cards, but they don’t want to carry with two handsets. With the development of the times, the solution to two-handsets-are-too-much-for-your-pocket problem, dual SIM card mobile phones, appears.
2. The Upgraded Mobile Phone: Dual SIM Card
Dual SIM phones are in contrast with single SIM card ones, are those phones that come with two SIM card slots. Using two SIM cards in one cellphone is increasingly becoming an option that people are willing to consider. It allows the use of two services without the need to carry two phones at the same time. You don’t need to worry about the inconvenience of switching the SIM cards any more. 
⑴ Single Standby
In the early stage, dual SIM mobile phone does allow you to connect two SIM cards to the SIM card slots. But the Achilles’ heel is that it does not really work with both cards simultaneously. When the SIM card 1 is at work at a given time, the other card which is commonly referred to as ghost-SIM is unusable and vice versa. These phones are called dual SIM single standby mobile phone.
If you want to change to the other SIM card, you have to turn the phone off and then back on. In spite, latter you don’t have to turn the phone on and off to do so. And you only can use the two SIM cards alternately. It does not bring much convenience compared to carrying the second SIM in your wallet and changing it when necessary. It just saves you the trouble of removing the back cover and battery, reducing the replacement time by a couple of seconds or minutes. It does not even come close to fully solving the problem of using two mobile phone numbers at the same time.
All in all, this solution is only applicable if you use the alternative SIM card rarely or you use it only for those casual outgoing calls.
⑵ Dual Standby
More recently, some mobile phones have been produced that can natively work with two SIMs, both of which may be active at the same time. Such mobile phones are called dual SIM dual standby mobile phone. These more recent models allow switching between the SIM cards without turning the phone off. It usually comes with a switch SIM option interface appears on the phone menu. This is great solution to the two-handsets-are-too-much-for-my-pocket problem.
① Double Processor
Initially, the solution to dual SIM dual standby is achieved by double processor which means that mobile phones come with two sets of basebands, RF transceivers, and protocol stacks. Actually it means inserting two mobile phone mainboards into the shell of one mobile phone.
The most distinct feature of this kind mobile phone is that you could use the phone number of SIM1 to call the number of SIM2, and vice versa. You can receive calls from both SIM cards. If the numbers of SIM1 and SIM2 are being called simultaneously, the phone screen will display the two incoming calls. And you can choose either of them to be connected.
However, the main flaw is that it nearly has twice battery consumption, radiation level, and manufacturing cost as ordinary single SIM card mobile phone. There also exists the co-channel problem that may disturb the signals of your mobile phone. And it is impossible and no need for you to talk to two persons at one time on the phone so that dual SIM dual standby mobile phone with double processor is becoming less and less and withdrawing from the market.
② Single Processor
Latter, a smarter solution was found, single processor with IC controller. And it also can let the two SIM cards being active at the same time. Although it is impossible to use the phone number of SIM1 to call the number of SIM2, and when the numbers of SIM1 and SIM2 are being called simultaneously, you only can receive the first incoming call, yet in comparison to double processor, single processor mobile phone has its particular advantages since it only comes with a set of baseband, RF transceiver, and protocol stack, which means much less manufacturing cost, less battery consumption, less radiation quantity, and no co-channel problem. And it is quite enough for ordinary usage. Therefore, it is getting more and more popular in the mobile phone market and widely accepted by the cellphone manufacturers.
Nowadays, there are also some Chinese triple-SIM card phones in the market. But that is not quite necessary. Dual SIM is enough for most people’ phone use. Most mobile phones from Sourcinggate are dual SIM dual standby phones with single processor of low price. Not just one that only can store two SIMs, but one that is actually capable of operating them as easy as one-two-three. The Dual SIM Dual Standby Mobile phones all have switch settings of SIM cards. You can choose among Only SIM1 Mode, Only SIM2 Mode, and Dual SIM Mode.
In the following, there are two powerful dual SIM dual standby mobile phones with single processor form Sourcinggate which are in good quality and cheap price. We hope this may prove useful to you.
ⅰ. 9700 Dual SIM WiFi Music Cellphone with Swiveling Keypad
9700 is newest dual SIM card mobile phone launched in Soucinggate.com until now. With it, you don’t need to take two handsets, since it contains two SIM card slots. And the two SIM cards could be activated simultaneously. You can place a personal and a business number in the SIM card slots, and calls from both of the SIM cards will not be missed.
In addition, it also comes with pretty design and powerful practical functions, including swiveling QWERTY keypad, trackball navigation, Java expansion, WiFi module, Powerful video decoder, analog TV, built-in accelerometer, and bluetooth technology.
ⅱ. Fly-Ying F030 WiFi TV Mobile Phone with FM Transmitter GPS
Fly-Ying F030 is also a powerful dual SIM card phone. When traveling aboard, you can use the SIM card of your country and an additional SIM card for the country visited. You no longer need to carry two mobiles on you at all times. You could easily switch the cards without opening your mobile phones.
http://www.sourcinggate.com/dual-sim-phones-c-145.html
Of course, the main highlight should be its GPS navigation function and FM transmitter, both of which will enhance your car diving experience. Other core functions include WiFi network connection, analog TV, and high vivid 3.0 WQVGA touchscreen.
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