Using a microphone like the Andrea SG-110M, which is unidirectional (picking up in a single direction), helps you control the quality of your audio a lot better. It works by simply plugging into your headphone jack and recording and is compatible with iPhones and Android devices.
As with laptop microphones, the closer you sit to the lecturer/source of recording and point the microphone directly towards them, the better the sound quality will be.
They are compact and lightweight for easy transportability.
We do recommend using a unidirectional headphone jack microphone when recording via your mobile phone, as this should generate the best captions possible for you.