You pick up the receiver. No dial tone. Or worse, you dial a friend and hear a single, curt beep followed by a robotic voice: “We’re sorry, the number you have dialed is not accepting calls at this time.”
You try to call three different landlines in three different area codes. All of them give you a similar "This number is not in service" or "Call cannot be completed as dialed" message. how to unblock a number landline
You call. It rings once (or not at all), then goes to a fast busy signal or a specific recording saying the subscriber is not accepting calls. You pick up the receiver