How I can get an audio file recorded via iPhone to play back in Android.
3 Answers
I don't see iLBC codec listed in the decoder section of Android supported media formats
Looking at the iPhone list of supported audio formats: iPhone audio formats, it looks like if you're just going iPhone => Android, then AAC or PCM are your best bets for encoding on iPhone, decoding on Android.

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You should record your audio on iPhone with AVAudioRecorder .wav format. See this thread how to configure AVAudioRecorder to get wav format on iOS.
Good luck
In terms of a built-in capability you can check the documentation as easily as I can.
Assuming no built-in capability, if you have working java, C, or (with caveats) C++ code capable of decoding the file to linear pcm samples and no legal obstacles to using it, then you can write an application to do so.

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