The Nokia Lumia 630, which got unveiled at Build 2014, is one of Nokia's upcoming budget smartphones - it is expected that the device will be priced at $159 off-contract for its single-SIM variation and $169 for the dual-SIM one. It seems that in order to charge this little, Nokia did not include some sensors in the device, as it appears that it lacks a proximity and ambient light sensor. The former is used to detect objects in proximity – e.g. your face, so it can lock the screen during a call. The latter is used for automatic display brightness control.