It depends upon the location. I'm from the US, and it is customary here to simply say something like "we're all set" which indicates that you aren't going to order anything else and are ready for your bill (servers in the US rely on tips or gratuities as part of their salary, so as a rule they return to your table frequently throughout your meal to inquire whether you want more coffee or dessert or whatever. It is during one of those inquiries that you would tell them that you were ready for your bill, or "check" as it is often referred to in US restaurant lingo.) If, for some reason, the server didn't bring your bill and you were ready to leave, you would approach the manager or cashier and tell them "we haven't gotten our bill."
Student or Learner