What file format is the prefered solution for audio typing/transcription?

[DerrenBrown]

Hello all,

I was recently asked to record an interview for research purposes. I managed to do this fine as my phone has a recorder built in. I have since noticed that my phone unfortunately saves the file in a proprietary wave format that is supposed to be rather uncommon. Is there anyone out there that could help advice me on how I can change that format to the preferred type for audio typing and transcription services?

Thanks a lot.
Derren