Since Zac can hear Ana's thoughts, he must have a mobile phone. It has a circuit, rings, uses GPS positions, encryption codes, play music, songs etc ... That is all described in the book. The morse code and other stuff to decrypt/translate may be just a diversion since YOU DO NOT HAVE to speak English. Once translated these may direct you further away from the obvious. The drawings might/must be enough to get the solutions. Anyway, who cares now?

Here is such a solution: Diamonds are a girl's best friend. Marilyn Monroe. Star. Film: Niagara. But I don't have the mobile number to tell MS that....LOL