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Beckham has supported UNICEF since his days at Manchester United and in January 2005 the England Football Captain became a Goodwill Ambassador with a special focus on UNICEF's Sports for Development program.

On 17 Januari 2007, Rebecca Johnstone, a 19-year-old cancer patient in Hamilton, Ontario, Canada received a surprise phone call from Beckham. After the conversation, he sent her a Real Madrid Jersey with his signature on it. Rebecca passed away on 29 January 2007.

Beckham is currently a spokesman for Malaria No More, a New York-based non-profit launched in 2006. Malaria No More's mission is to end deaths caused by malaria in Africa. Beckham appears in a 2007 Public Service Announcement advertising the need for inexpensive bed nets. The TV spot currently airs in the U.S. on FOX Networks including Fox Soccer Channel, and can also be seen on YouTube.

Since he has joined MLS, he has been a very public advocate in the U.S. for related charities such as MLS W.O.R.K.S. On 17 August 2007, he conducted a youth clinic in New York City's Harlem, along with other current and former MLS players. This was in advance of his first New York City area match the following day against the Red Bulls. That team's Jozy Altidore and Juan Pablo Ángel also were with Beckham, teaching skills to disadvantaged youth to benefit FC Harlem Lions.