You'll need to explain your issue/problem in a bit more detail of you want help here. Do you mean that you're roaming abroad but have no service? At all? I.e. no calls, texts or data? Where are you? What membership are you on? What make and model of phone do you have?
I am not a 48 employee so if you need to contact 48 support then use option 3 or the chat facility here.