If your phone presents the caller's number then I believe your service provider is obliged to offer anonymous caller rejection (ACR):
Quote:
... but Brussels came to the rescue with Article 8.3 of the Telecoms Data Protection Directive (97/66/EC), which states :
"Where presentation of calling line identification is offered and where the calling line identification is presented prior to the call being established, the called subscriber must have the possibility via a simple means to reject incoming calls where the presentation of the calling line identification has been eliminated by the calling user or subscriber."
In effect this means ACR, and Article 15.1 requires :
"Member States shall bring into force the laws, regulations and administrative provisions necessary for them to comply with this Directive not later than 24 October 1998."
The DTI finally brought in the Telecommunications (Data Protection and Privacy) Regulations 1999 (formerly 1998 ;-) ) under the Data Protection Act 1998 on 1 March 2000. If your telco hasn't implemented ACR yet, try quoting the Regulations at them, or inviting them to talk to Oftel.
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From:
http://www.ainslie.org.uk/callerid/cli_faq.htm#Q_17
Act:
http://www.opsi.gov.uk/si/si1999/19992093.htm#12