Ogg ringtones are common in Android phones, and the default ringtone on iPhone should be AAC format (m4a). Compared with MP3, ogg and AAC have the advantages of higher compression ratio and less loss of sound quality at the same bit rate, so the two formats have been used in some portable playback devices for a long time. Android uses ogg as the default ringtone format for the following two reasons: 1. As mentioned earlier, the compression ratio of ogg is higher than that of MP3, and using ogg format for the same audio source file can reduce the file size. Although the ringtone file is usually small, it can save a little from the storage space of the current mobile phone, and now many mobile phones do not support external SD cards. 2.ogg is an open source format without any patent authorization. Compared with ACC codec, MP3 patent is in the hands of private companies. Because Android comes from Linux system and has the open source characteristics of Linux, ogg format is obviously a better choice.
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