Need tech Help phone not working

[rdcrds]

Ok long story but the bottom line is i did not like the phone number that they gave me with my EVO so i called up and they changed it.

Now i go to call out and i get the your phone can not be vailidated.

I called in and they had me do the pound pound number pound thing and that did not go to the edit screen so she was going to send me to tech support but i hung up because i got this thing rooted and a custom Rom on it from XDA the most popular one there.

Anyway to get this to work do i need to flash back to stock rom or what? cause my internet works but the stupid phone does not.

Any helps many thanks.