coastee wrote on Jun 4^th, 2010 at 2:44pm:

From the clear message given when calling this number it seems odd that would not identify themselves when you answer. (I assume that you know that they are "cold calls" because of what is said.)

If they are hanging up in silence, then you should report the matter to Ofcom confirming that you are caused unnecessary inconvenience, annoyance and anxiety. The content of the message suggests that they would be "persistent" in this practice and should therefore be subjected to a Notification of Persistent Misuse on the basis of this evidence alone. This is not Ofcom's policy and so you may wish to ask why Ofcom is failing to comply with the expectation of parliament - "We expect you to use your powers to eradicate the nuisance of Silent Calls".

If you are unable to answer their calls, but are curious to know who is trying to contact you, even though you do not recognise the number, then why not simply call it? (The call is free, or rather inclusive, from a landline or public payphone.) My advice is that those who wish to satisfy this type of curiosity may do so at their own risk, but should not be encouraged.

I personally disapprove most strongly of the way in which this particular number is used. It serves no purpose other than satisfying rather pointless curiosity, or alternatively is to cover the practice of making Silent Calls - which is totally unacceptable, and in no way mitigated by this misuse of CLI.