Swedish-Japanese mobile phone maker Sony Ericsson on Tuesday unveiled four new phones, including two with autofocus cameras and one with <A HREF="http://news.zdnet.com/2100-1035_22-5594425.html?tag=zdnn.alert">a Walkman-branded portable music player.</A> With the Walkman phone, the company is using Sony's 26-year-old Walkman brand to crack the mobile music market, a top growth area for 2005. The model will start selling early in the second half of 2005. It will have about 500MB of memory, good quality headphones and the ability to easily import tracks from a personal computer and other devices.