The Usefulness of Dual Sim Phones
If traveling a person could insert a foreign SIM card while leaving their native SIM card in the phone. Phone manufacturers stayed clear of dual-SIM phones for some time due to pressure from service providers who wanted to keep their customers using their service in all situations.
An early version of the dual-SIM phone was created by a dual-SIM holder which attached to the back of the battery holding two SIM cards at one time. Next the dual-SIM adapter was developed. This adapter slid into the SIM slot and held two SIM cards at once. Both of these concepts created a standby dual-SIM phone. The use of these holders and adapters required restarting the phone when you wanted to use the second SIM card. Recently produced dual-SIM phones are mostly active dual-SIM phones. These phones have two SIM card slots allowing simultaneous use of two SIM cards making the concept a seamless one in use.
The First Dual Sim Phone
The Best Dual Sim Phone
LG Optimus Net Dual
The camera is with its 3.15 megapixel a little weak, but it's still good if you consider all the additional features. The camera supports geo tagging, auto focus and much more. The battery life is not quite good either. Since this phone comes with the Android OS already installed, this is no surprise. Android phones always were famous for draining the battery quicker than most notepads. You get about 5.5 hours of talking time or 330 hours of stand by with a fully charged battery.