I received a telephone call last evening from an individual identifying himself as an AT&T Service Technician (could also be Telus) who was conducting a test on the telephone lines. He stated that to complete the test I should touch nine (9), zero (0), the pound sign (#), and then hang up. Luckily, I was suspicious and refused.
Upon contacting the telephone company, I was informed that by pushing 90#, you give the requesting individual full access to your telephone line, which enables them to place long distance calls billed to your home phone number. I was further informed that this scam has been originating from many local jails/prisons. Do not press 90# for anyone.
See the following website for clarification: http://www.snopes.com/fraud/telephone/jailcall.asp