When you are attempting to download the app on an Apple device, you may be prompted to enter payment information for the Apps Store. FollowMyHealth™ is not the reason why you have to enter this information. The reason why the Apps Store asks for your payment information is because if you choose to purchase an app, then you won't have to enter your payment information each time. The key thing to remember is that you won't be charged unless you actually purchase an app. Since FMH Mobile is free, you will not be charged for downloading the app.
If you want to get around having to enter this information, click on the following link for instructions: Bypassing Payment Information