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sending audio through SMS

You should be able to send it via MMS regardless of size. The MMSC (Multimedia Service Center) on the recipients network will transcode it for the target device base don that device's profile in the system (right file type, etc). You may be able to send a 5MB MP3, but they would get a smaller version that has been degraded through transcoding on the network.

YMMV, each carrier is different and each device is different. 2 different models would likely get two different results of the same file when it arrived on the device.
 
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