The number you are dialing has to be the same as the number you registered with PhoneGnome.
In other words, it's like your PhoneGnome Account for let's say 515-233-2332 is calling 15152332332....
In your PhoneGnome Account, under call analysis, see the format that is being dialed right now....than adjust as needed
BTW, this may help:
WorldWide Local Calls
Also check the original RFD thread for some updates....