Oneplus is a startup Chinese company which started manufacturing phones since the past two years. Their budget offering.the oneplus x is a killer offering considering its sub 20k rs price range. The phone is powered by a Qualcomm snapdragon 801 chipset and packing in about 3 gigabytes of RAM. It has a 430 adreno gpu and 16 gb of internal memory. Though there is an expansion slot for inserting an SD card which also doubles up as a second sim card slot.which means you can either have an SD card or a second sim but not both at the same time. The phone runs stock Android with oxygen OS and the phone is buttery smooth. As a proud owner of an oneplus x.I suggest to simply go for it.hands down as this is the best sub 20k rs phone in the Indian market. The only issue of this phone is its battery which is less than 3000mAh