I'm in Germany and I can see it, but it's just not working. I can dial but allways get the message that my call could not be completet (tried to call US, Canada

I'm in Germany and I can see it, but it's just not working. I can dial but allways get the message that my call could not be completet (tried to call US, Canada and Germany). My fault, Googles fault or does it show up without working on purpose?