It will go how you take it. Lumia 730 is a bit outdated (believe me its already 6 months old). No doubt it comes with excellent or shall we call luxurious specs ( a 1.2 GHz Quadcore Qualcomm Snapdragon 400 chipset packed with 1GB of RAM and 8GB of expandable internal storage, the most loving thing about Lumia 6.7 MP Camera ft. Carl Zeiss tech.). Hold on!! Don't be so excited. Lumia 640 has much more to offer. Rumoured with operating specs same as that of Lumia 730, along with comparatively larger (5") display, it features a 8.7MP camera but the selfie camera is 0.9MP (of course its horrible), full connectivity suite is also going to be present in the Lumia 640, headed by LTE and NFC. Wireless charging support via a dedicated back cover is also rumored. NOTE THAT THESE ARE RUMOURS. The price range of Lumia 640 is going to be the same as that of Lumia 730. And the most important thing, it comes preinstalled with WINDOWS 10.