Martha Is Dead features 8 Telephone Numbers required for trophy 
The Fool. To dial a telephone number, you need to interact with either telephone in the house and you can do so beginning with Chapter 8 – The Burial. Below is a list of all the Telephone Numbers needed for the trophy and when you can dial them. When speaking over the phone, it’s better to lie to obtain the information you need. It’s recommended to work on this trophy as you play through the game the first time to avoid too much backtracking.
Chapter 8 – The Burial
- 6934, can be dialed at the start of Chapter 8 – The Burial. A partisan picks up. This is part of Lapo’s quest which starts in Chapter 6.
- 6978, can be dialed at the start of Chapter 8 – The Burial. The Carabinieri pick up.
- 6593, can be dialed at the start of Chapter 8 – The Burial. The Doctor picks up.
- 1185, can be dialed after calling the Doctor and visiting Giulia’s dad’s office. The German Command in San Vincenzo a Torri picks up.
- 6537, can be dialed after saying good-bye to Martha inside the courtyard’s small church. The graveyard’s office picks up.
Chapter 11 – The Graveyard
- 6938, can be dialed at the start of Chapter 1 – The Graveyard. Don Attilio picks up.
- 0782, can be dialed after picking up the telegram from the front door’s mailbox. The Asylum picks up.
- 6822, can be dialed when the power goes out. The Town Hall picks up.
Chapter 12 – Memories
- 6938, can be dialed shortly after the beginning of Chapter 12 – Memories. This is an unmissable call and story-related. Attilio picks up.
These are the Telephone Numbers needed for the trophy The Fool in Martha Is Dead.
MDSP says
Seems like there are a couple corrections that need to be made with this list.
For me, the doctor (and subsequently, the German Command) was only callable in chapter 11. Also, I had to make specific choices to have the German Command callable at all. You have to say you’re feeling good in the last choice.
Haberdashery is missing in the chapter 8 list. This is callable after picking up the letter in the basement near where the scissors are, number is 6987.
The town hall in chapter 11 can be called immediately after calling the asylum, no need to wait until the power goes out. Also, the number is 6922, not 6822.