It is not very obvious but I thought about it. Just go to settings\call out #s and add your country code there ("1"). The application will assume any number that starts with "+1" is local. Just in case: if you also add the "area code" the application will try to build international numbers for you automatically for any number that it is not "international" when required (for example when trying to place a call using qgvdial). It is an unfinished/unpolished feature but it should work as it is.