It doesn't matter if your number matches a payphone or not, you're still going to have a non ANI II payphone number (07, 17, 77). If you get an operator to call, your ANI II # wont match a payphone's, and the second operator (the one you are trying to get a free emergency interuption from) is probably going to find it suspicious and start asking questions, you'd be lucky if they let you. And if they did, I wouldn't be suprised if it's recorded and played back for a check up later.