So you are looking for a simple tool that can record important iPhone calls? The Magmo has you covered. It is a snap-on MagSafe call recorder that you can use anywhere. It has a slim, lightweight design and can be activated with the push of a button. When you are finished, slide the button down and the recording stops.
Magmo uses a piezo sensor to capture vibrations transferred through your phone. It doesn’t require a stable connection to work. The device has 32GB of storage space, which is enough for 500 hours of recording. It is compatible with your Lightning cable. This project is currently on Kickstarter. More info is available here.