Thanks gaz6076
I did find the file but my provider (ICE Costa Rica) is not listed.
Plus I checked for 119, voicemail, costa, costa rica and every other possible filter, but nothing.
I even went trough most of the file manually but nothing.
It's very frustrated with apple, why just not have simple settings under general/phone or something.
My voicemail is set to dial 119 - I need to change that to 1190.
Any more suggestions.
My iPhone 4 is factory unlocked (bought in Canada), jailbroken, works perfect in Costa Rica in 3g and GSM.
Note: Costa Rica is not recognized as official seller for iPhone yet.
TIA