While not currently available from any of the major cell phone companies, demand for unlocked dual SIM phones continues to grow. As an increasing number of people need to use 2 numbers for their business and personal calls, the ease of doing both from a single handset is becoming necessary. This technology has been developed over the last several years, evolving from a rudimentary alternative into a convenient and quality substitute.
Dual SIM technology began by simply allowing the insertion of two SIM cards into a single phone. However, both cards could not be active simultaneously. Users were required to turn the phone off in order to switch between cards. This gradually developed into software that allowed users to switch between cards without turning the phone off. However, this did not address the main flaw, and only one SIM card could be used at any time. If users were expecting calls from both lines, they had to choose which SIM to have active. One would be able to receive calls, and the other disabled. While this did save the pocket space of carrying two phones, the requirement that one line be inactive at all times was a significant drawback.
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Recently however, smaller mobile phone manufacturers have released models which allow the continuous use of dual SIM cards. With all the functionality of two phones, these dual SIM, dual standby phones are as good as it gets. Users can see which number incoming callers are using, and can choose which SIM to use for outgoing calls with the push of a button. No more switching is necessary, and users have the freedom to manage two separate phone lines without the hassle of carrying two handsets.
The latest in this line of improvements is the CECT i9 3G. This iPhone type model comes with everything you would expect from an iPhone, along with the ability to operate Dual SIM cards from any mobile carrier around the world simultaneously. The only real drawback is that now users have no excuse not to be available on either line at any time. Hey, nothing is perfect, right?