Most carriers limit MMS attachments to around 1MB . If the file is too large, it may be automatically compressed, which can lower the audio quality. Setting the Received File as a Ringtone
While newer iOS versions have simplified the process, GarageBand remains a powerful free tool for converting any song into a ringtone on older iPhone models. Send Ringtone To Phone By Text Message
Find the audio file (usually in MP3 or M4A format) in your phone's Files or Music app. Most carriers limit MMS attachments to around 1MB
While traditional text messages (SMS) are limited to 160 characters of plain text, modern smartphones use or Rich Communication Services (RCS) to send audio files that can be used as ringtones. How to Send a Ringtone via Text it may be automatically compressed