What do I do yahoo im in trouble?

My friend and I got caught prank calling and the police are coming over to issue a warning to tell us not to do it again. We won't. I am just unsure what to say to them if they ask if we have been calling other people? We've called like 2 other people, but are unsure if we should tell them no. We aren't sure what they are going to ask either. Any tips when talking to them? Thanks anything helps!