Thanks a lot!
It seems that the HTC One Mini has problems with the GSM mode, see also http://www.android-rsap.com/compatibility.html
. While other HTC phones only support the GSM mode, the One Mini does only support the non-GSM mode! This makes it incompatible with many car phones, like Porsche PCM, Mercedes SAP module, Audi SAP module and Opel. It may also happen that other car phones, like VW Premium, choose to switch to GSM mode for whatever reason, so they may also fail!
Be sure to test your exact configuration before buying the app. There is a high risk that it doesn't work!