There is no proof that Christian B. was in Praia da Luz the night Madeleine McCann was kidnapped.
The German investigators have no way of determining whether the mobile phone 912 730 680 (which was in Praia da Luz when it received a call from the mobile phone 916 510 683 between 7:32 p.m. and 8:02 p.m. on May 3 2007) was being used by Christian B.