France plans to install landline phones in prison cells in an ambitious attempt to improve rehabilitation rates and reduce rampant mobile phone trafficking behind bars. The justice ministry said on Tuesday it had called for bids to operate the service after successful tests at one prison since 2016. But inmates’ new freedom to call up to four pre-approved numbers at any time of the day will not come cheap, with one prisoner advocacy group warning that calls could cost up to 80 cents ($0.97) a minute. Like other countries, France has struggled against the smuggling of mobile phones into prisons. More than 19,000 handsets and accessories were seized in the first half of 2017, for an overall prisoner population of about 70,000. “There have always been call boxes in prisons, but the inmates need to be accompanied by personnel, which requires time and availability. It gets complicated,” the justice ministry said.