Although recent news indicates that some prisoners have mobile phones and sometimes they use them to access the Internet, the Justice Department has just announced that French prisons will use new high-end cell phone jammer. Your costs have not been stated.
Christiane Taubira yesterday announced the outline of a plan entitled "Anti-Terrorism Justice" (PDF) following a statement by Manuel Valls following the Charlie Weekly attack. A total of 181 million euros will be released over the next three years-of which 110 million euros will be released in 2015. As a result, prison administrations will benefit from a protection fund of 43 million euros, part of which will be used to purchase high-end cell phone signal jammers. However, no plans have been provided for Place Vendôme.
The judicial authorities will receive a € 56 million envelope within three years. Part of the money was used to strengthen its IT resources, and the ministry explicitly mentioned procedures such as "remote computer search, data collection" (especially through the latest counter-terrorism laws). Even "new technologies for genetic analysis and electronic rotation."