Duke Nukem Forever

Throughout the game you will find telephones at different places. Some of these phones, 14 to be exact, have a recorded message for you to listen to. To listen to those recordings, simply interact the phone using . You won't have to actually listen to the whole message, you can just turn it on and walk away from it if you don't find them very interesting. Here's a list of all phones you need to find for the trophy:

Duke Lives
1. After you have finished playing a later version of Duke Nukem 3D, you should see a white door on the other side of the room that leads into a bathroom. Enter the door and look for the phone on the wall in there.

The Duke Dome
2. After you've blown down a container and walked through it you will see a rectangular building to your right. Enter the building by climbing up on top of it using a ladder on the back of the building, then jump through one of the windows on the roof. You will find the phone sitting on a wall.

Duke Nukem's Titty City
3. Right where you start this Chapter, turn around and you'll find the phone lying on the desk right in front of you.
4. Go into the main room of the strip club (the big one with a strip table in the middle of it). Turn right and enter the corridor. Follow the corridor straight all the way until you get to a door saying "Employees Only". Enter that room and continue up the stairs. You will come to another door upstairs, and as soon as you enter that room, turn left and you'll see a desk with a computer screen on it. The phone is lying on that desk.
5. Walk back out to the main room and you will see a bar to the left. Enter the bar by opening the bar desk with . In front of you it should be a locked door and a sign on it saying "Private". Open the door using the code 4768, and enter the room. Follow the room all the way to its end where you'll see a desk. Sitting on the wall right next to it is the 5th phone.
6. Go out of the bar and look to your left for a doorway with a sign saying "Champagne Room". Enter that room and turn left. You will see a woman standing behind a desk taking care of all the costumers that wants a lap dance. On the desk it's lying by a phone.

The Duke Burger
7. As soon as the Chapter begins, turn around and follow the corridor hall all the way to its end. You will see a desk to the left with two cash registers on it and behind there's a shelf with some Duke Nukem action figures. On the same as the cash registers is the 7th phone.

The Mighty Foot
8 & 9. After running out of gas for your monster truck, you will have to enter a small building on the side of the highway in order to find some more gas. Do so, and when you're in that building, look on the two desks in there for two phone messages.

The Shrunk Machine
10. After you have got the Freeze Gun in the beginning of the Chapter you'll enter a room full of Pig Cops. On the other side of the room you will see a doorway with two doors. Wait until a Pigcop kick the doors up and enter the room. In front of you will be a desk with another phone on it.

Generator Room
11. Right in the beginning of the Chapter you'll be riding an elevator. When the elevator doors open you will see two dead EDF soldiers lying on one bench each. Turn left and continue towards the doors. As you're walking toward the doors, look to the right and you'll see a phone on the wall next to a drinking fountain.

The Clarifier
12. In the beginning of the Chapter it will come out a Pig who kicks up the door. Right after that you will have to enter a door that is directly in front of you in order to proceed further into the game. Enter that room and to the left there's a double door for you to open. After you have entered the next room it will be a desk in front of you. On that desk it's a lying phone.
13. Right after the last phone you will fight a group of Pig Cops. After killing all of them you have to move the ledge on wheels with a ladder attached to it. Climb on top of that and you have to drop down a hole into a room. In front of you there will be a desk with the 13th phone lying on it.
14. In the end of the Chapter you'll come to a huge room with electrified water in it. When you have crossed the water you will come to a staircase going up to the second floor. When you have got all the way up the stairs the last phone will be waiting for you on the wall in front of you.

Here's a video showing the locations of all phones:

Credit goes to PowerPyx.