Page "Automatic number announcement circuit" Paragraph 295

* 020 81 803 803, Same recording as 08081707788.

These numbers are set up by a company offering low charge calls in the UK, these numbers are meant to be used as a sort of operator that you go through in order to qualify for these cheap calls.

However, if the phone you are dialling these numbers from is already registered with this company it will not announce your number.