We're giving away a Samsung C3053 or "Teko phone" to one lucky Chelsea FC fan on MXit. To enter, simply answer the Ultimate Chelsea Fan quizz on the Samsung contact and try to get them all correct to be entered into the final draw.

Don't have MXit? Download the MXit app by navigating to mxit.com/wap from your phone's mobile browser and follow the instructions. Once signed up and logged in, visit Tradepost > MXit Mxit > The Small Screen and choose Samsung.

There are other ways to log on to MXit. See http://www.mxit.com for details.

Remember to also enter the Battle of the Giants competition where you could win a trip to see The Blues take on the Red Devils at Old Trafford on 3 April 2010. See http://www.samsungchelsea.co.za

Mobile phones are not associated with an increased risk of the most common type of brain tumour, finds the first UK study of the relationship between mobile phone use and risk of glioma. The results are published online by the British Medical Journal. The four year study by the Universities of Leeds, Nottingham and Manchester and the Institute of Cancer Research, London found those who had regularly used a mobile phone were not at a greater overall risk of developing this type of tumour.

A significantly increased risk was found for tumours which developed on the same side of the head as the phone was reported to have been held but this was mirrored by a decrease in the risk on the opposite side of the head making it difficult to interpret as a real effect.