Secret Message 2
Destroy the Ares and Minotaur statues in the throne room at Olympus (use Lance of the Furies: L1+Circle). The secret message is a scrambled telephone number, just read it from left to right to figure it out... it should be pretty obvious. Call the number to get a pre-recorded message describing how cool you are (or aren't).
In the Beginning of Act 2, there are 2 women in your bed when you are inside your ship. If you jump on the bed, A circle will appear above the bed, indicating a Mini-game. Press Circle, and the game will start. All you see is the vase, but as you get further, the vase will shake more and more, until it falls and breaks. you have to press the buttons as it commands it. closer to the end, you have to rotate the Left Analog Stick. If you win, the first time, you get a large amount of Red orbs. Everytime afterwards, you get 5 more.
Surrender Kratos Message
Outside the Temple of the Oracle, in the area with the Gravedigger. Look on the left ledge near a red orb chest, there should be a small firefly buzzing around, Press R2 near it. Now quickly run to where the Gravedigger is and stand on top of the highest mound of dirt, Press R2 again. Finally, run south across the bridge and stand between the two torches and press R2 one more time. If done correctly the words "Surrender Kratos" will be written in the night sky in cursive.
Secret Number after you beat God Mode
There is a secret number you receive after you defeat God Mode. The secret number is a non scrambled telephone number. Call the number to hear an interesting side story to what really happened to the final boss.