you would have thought the police would have asked him before appealing for information about the phonecall (which in any case was not made from Germany was it?)
https://www.standard.co.uk/news/crime/madeleine-mccann-german-suspect-phone-number-a4460916.html
Wolters doesn't say or know from whence this call was made.
CBS.
Hans Christian Wolters: And in Germany, we … charge someone only if we are sure that he will be sentenced by the court. If there are doubts … we don't charge him.
Wolters says one key piece of evidence they need is to find the person who made that call to Brueckner's cellphone approximately one hour before Madeleine disappeared on May 3, 2007.
Mark Hofmann: This might be the only person who could confirm that indeed, Christian B. was holding his cellphone … in his hand that night. … And this would be proof that not just his cellphone was at the crime scene, but that he was at the crime scene.
Although investigators made an appeal to the public, they have been unable to identify the mystery caller.
Hans Christian Wolters: The phone which was used for the call to Christian B. was a prepaid phone. … So, we are not able to find this person in an easy way.