Cheats are not Working?

First things first. I'm not sure if this topic is in the right section if we have to move it then we'll do so.
Moving on, I have a problem with iEDGE and all my cheats. I use the r4cce for cheats and when I had a look at the cheats in that list, my game was there. Then I enabled cheat codes on my DS and still nothing.
Any ideas?

Replying to #1

More details. What kind of cheats. And what game? What's the ID Number and what's the version of the game(U or E)?