Filtering Nuisance Calls.

Register with the Telephone Preference Service (TPS). If you are registered with the TPS and still receive calls, you can complain to the Information Commissioner’s Office (ICO) on 0303 123 1113 

If you are with Orange, O2, T-Mobile or Vodafone you can forward spam texts to 7726. If you’re a Three user, text 37726. 

Read more: http://www.thisismoney.co.uk/money/bills/article-3362139/How-annoy-cold-callers-phone-number-use-back.html#ixzz3uXiZNyph
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