Have you ever been blocked by a landline? Did the star codes work for you, or did you have to resort to snail mail? Let us know in the comments below.

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. 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 cannot unblock this from your phone. The recipient must go into their landline portal or dial *60 (on most US carriers) and remove your number.