It is said the magic cellphone ringtone, with a frequency of above 8000HZ, can only be heard by people under the age of 25, whose hearing of high frequency sounds have remained unimpaired.

• 这种铃声的频率在8000赫兹以上，据说只有25岁以下的人能听到，因为青少年的高频听力还没受损伤。