## Codes, Nothing comes up

[aintitfun]

When I type in any of the ## codes I have found, nothing comes up on the screen at all, it just sits there. Unless I am an idiot, I thought you were just to type them in the dialer just like a phone call, like ##775# for PRL. I am using RegawMOD 2.1t rom with a dialer that I am pretty sure is not stock, is that the problem, if so, what can I do to get around this. Thanks in advance.