I see its a national number but when I get through, the call centre is actually in Europe. Do I still pay national call rates?
I checked sql plus again now. It seems it cant resolve the host string. Because even if I enter an invalid user or password, there is a moment of waiting then it returns the error ORA-12154 TNS:could not resolve the connect identifier specified. So now my question is what do I use for the host string? And must anything be configured after I install Oracle?