When you're podcasting on the move you can use your iPhone microphone is a decent recording option. Especially when you lack a portable recording kit.
Enable Your iPhone Microphone for Recording
When you want to start recording you'll need to use an app to save the audio.
Using The Voice Memos App
The native Voice Memos app is a great way to get started. There's nothing to download and you can get started by simply hitting the red record button.
Audio files recorded by Voice Memos are m4a. You can transfer the audio to your computer using the iPhone's share feature to email, AirDrop or even sync all your Voice Memos recordings using iTunes.
Open your m4a file inside Adobe Audition and many other audio editors for editing as m4a is essentially the audio part of a video mp4 file.
How to Make the iPhone Microphone Sound Better
A simple solution to make the iPhone mic sound better is to buy a microphone windshield. They are super cheap on Amazon and will improve sound while reducing clicks and pops. It also makes your iPhone look similar to a professional portable recorder.
Using an External Microphone with the iPhone
The iPhone microphone produces great audio quality all by itself. You are also able to plug external microphones into an iPhone and produce even better sound. I'm never without my Rode Smartlav+ Lavalier Microphone for Smartphone when I'm podcasting on the move. It's extremely portable and produces an almost studio quality sound.