The sale of world's most expensive mobile phone number has earned a Qatar telecom company a place in the new edition of Guinness Book of World Records.

The phone number 6666666 of Qtel, which was sold for $2.75 million (Qatar Riyal 10 million) to an anonymous buyer in an auction at a charity event last year, will appear in the 2009 edition of the book, it was announced.

The previous record price for a phone number was made in China where the number 8888-8888 sold for $480,000, (Qatar Riyal 1.75 million).

"Qtel has a long track record of innovative campaigns for the local community and we are very proud to have the mobile number auction commemorated this way," Qtel's executive director of group communications Adel Al Mutawa said.

First published in 1955, Guinness Book of World Records is published in more than 100 countries and 25 languages every year and sells more than three million copies annually around the world.

The book contains collections of internationally- recognised records, including human achievements and extremes of the natural world.