This reminds me of a weird payphone trick from when I was younger. I grew up in Santa Monica, which had GTE as the local phone provider (I mention this because

This reminds me of a weird payphone trick from when I was younger. I grew up in Santa Monica, which had GTE as the local phone provider (I mention this because this trick did NOT work on Pacific Bell payphones). They also owned all the payphones in the area. One day, I was messing around with the payphone after school, and decided to call the AT&T Alliance Teleconferencing number. This was a number where you could setup both an incoming conference call and the owner of the conference could make outgoing calls. It cost more than a dollar a minute per active line, and this was in the early 1990s, so it was really expensive. Anyhow, the phone number for AT&T Alliance Teleconferencing was a weird one, it was 0700-555-1212. Because it had a leading 0 for the number, it wasn't filtered correctly on the pay phones, so you could call it directly. This worked for years before they finally figured it out and filtered it on payphones.