Instructions
Press the "Pause" button.
Select the cell phone at the paused menu.
Enter˘237 on the cell phone and select the "Call" button. When the cheat is activated, a message will be displayed on the screen.
Go to the "Cheats" option at the paused menu screen and select the unlocked "D-stroy UFO" from the list to start using it in the game.
Resume the game with your activated "D-stroy UFO" in place.