Volvo On Call – Error “Cannot reach your Volvo”

I have the problem with my V70 that I have had problems with Volvo On Call (VOC) since delivery in May. Screenshot from the app in the system. Actually, the problem is not so bad as long as my heating doesn’t work and I don’t really need this expensive additional equipment (http://www.motor-talk.de/…/…ernbetrieb-nachruesten-t5133664.html), but it would be nice if the thing also worked. For months I have always had problems with the connection and if I call the diagnosis in the menu without exception always the error message as in the screenshot. Does anyone have an idea what I could do there? I only heard from the dealer that this must be on my mobile phone and will be consoled for months. I have a Samsung S4, so quite a common phone.