Problem
AMR (Adaptive Multi-Rate) file is an audio data compression scheme for speech coding. Your mobile telephone may support AVR format and record sound in the AMR format. This is a guide to convert AVI to AMR files.
Solution
AVI is a multimedia container format. To convert AVI to AMR, the first step is to convert AVI to WAV or MP3, then convert WAV/MP3 to AMR format.

Tips
See also
How to Convert AVI to AMV
How to Directly Convert FLV to AMV with Freeware
How to Convert AVI to MPG