The sales have started early when it comes to cutting-edge mobile phones, specifically with Carphone Warehouse knocking a chunk of cash off the Samsung-made Google Nexus S smartphone.A big chunk too, with £120 knocked off the price of the sim-free Nexus S at launch, down by almost a quarter of the retail price. Still £429.95, which is a lot of cash, but a more realistic price for sure. It's also been discounted in the UK by Best Buy to the same price, if you prefer to deal with them.No one knows why the phone has been cut so soon. The cynical might suggest disappointing pre-sales of the Android 2.3 phone, or the more positive might see it as a way of boosting sales even further in the peak trading season. Either way, it's cheaper, so if you pre-ordered at the higher price, you might want to get on your existing phone and discuss the matter.The contract price has shifted slightly too, with a contract Nexus S now available for free from £30 per month, £5 cheaper than the original price being promoted. If you order one online, you might get it before the year is out.