5. OnePlus X Ceramic version will be a limited edition with just 10,000 units becoming available later on November 24. NOTE: For those who are interested, here is what the 'invite' system is about - for the first month, the OnePlus X is available through invites only. In November, invites will be distributed much faster says the company, but only to its 'most loyal users, those who sign up for the reservation list, and your family and friends'. After the initial month, interested buyers have other opportunities to buy the OnePlus X. Every week open sales will be announced.