The Lumia 630 is basically a more affordable version of the Lumia 635. The only difference the two phones have are their connectivity and the fact that there is a dual-SIM version of the Lumia 630. Otherwise, they are equipped with identical specs and apps such as a Snapdragon 400 1.2Ghz quad-core processor, a 5-megapixel camera, a 4.5-inch ClearBlack IPS LCD main display with a resolution of 854 x 480, the HERE navigation apps (HERE Maps, HERE Transit and HERE Drive), and OneDrive. The dual-SIM version is loaded with the Smart Dual SIM feature that allows users to enable call waiting and call forwarding between two SIM cards.
** This phone is also known as: Nokia Lumia 630 Dual-SIM (has the Smart Dual SIM feature)
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