"Apparatus" is defined at http://www.legislation.gov.uk/uksi/2016/426/regulation/4/made http://www.legislation.gov.uk/uksi/2016/426/regulation/4/mad... . That d

"Apparatus" is defined at http://www.legislation.gov.uk/uksi/2016/426/regulation/4/made http://www.legislation.gov.uk/uksi/2016/426/regulation/4/mad... . That definition does not include walls or hammers. Also, that quote that you repeated does not come from the actual law, but is an interpretation the law for those curious about phone jammers. See my comment at https://news.ycombinator.com/item?id=12238960 https://news.ycombinator.com/item?id=12238960 for a link to the law.