Kindle is a product of Amazon which was manufactured and promoted by the Brand name itself. It is also sold by various other brands like Staples, Best Buy etc. However, Kindles sold by Amazon are pre-registered by Amazon while when sold by other brands have to be registered post sales. For customers having issues registering the device can call Kindle Phone Number 0-800-098-8929 to get help. This is a toll free number for UK region and customers can approach this number at 24/7 for best assistance.