Visitors to the new Abba museum in Sweden will be able to talk directly to members of the band via a special exhibit which features a working telephone. The group's career is the focus of a new permanent display at the Swedish Pop Hall Of Fame in Stockholm and fans will be able to see memorabilia and costumes, while there are also recreations of recording studios and dressing rooms used by the band. However, the most innovative feature of the museum is a room dedicated to hit track Ring Ring, which features a 1970s-style telephone. The handset is connected to a working phone line and the only people who know the number are ABBA stars Agnetha Faltskog, Anni-Frid Lyngstad, Benny Andersson and Bjorn Ulvaeus, who will all call in occasionally to talk to visitors. Curator Ingmarie Halling says of the telephone exhibit, "It was Frida's (Lyngstad) idea... so of course she'll call." The museum opens its doors to the public on 7 May (13).