For CuraSwing's musical swing feedback, it is important that the smartphone is attached to your wrist while walking. This is the only way to receive motivating and appropriate musical feedback from the app while walking. However, you can also turn off the feedback. When using CuraSwing in no-feedback mode, it does not matter whether the smartphone is attached to your arm or not. However, a different position of the smartphone (e.g. in your trouser pocket) will also change the subsequent evaluation of your swing behaviour. If you want a meaningful evaluation, you should always attach your smartphone in the same place, ideally to your wrist.