THE next time you call a handset, don't be surprised if you hear a cute, Bart Simpson style voice answer:""Hi! This is Handset Xiaoqiang. John Q is in a pretty bad mood these days because of too much overtime. When your call gets connected, be nice and let him grouch on about his boss for, oh about twenty minutes I guess. Ready? You're through."" Nowadays, pop songs and audio clips are all the rage as an alternative to the ""pippip"" standard old-hat switchboard tone.The coloring ring-back tone service (CRBT) is the latest accessory among young, faddy mobile phone users. Millions have downloaded the Lele123. corn-produced Handset Xiaoqiang.