The service would complement Britain's existing nationwide emergency number, Jansen said. BT has run Britain’s 999 emergency number for 84 years and is currently upgrading the system.
In March, Sarah Everard, a 33-year-old marketing executive, was abducted, raped and killed by a serving police officer who was convicted of murder and other charges this month and sentenced to life in prison without the possibility of parole.
Primary school teacher Sabina Nessa, 28, was killed six months later as she walked through a park in south London on her way to meet a friend.
“Male violence is causing so many people , especially women, to live in fear,” Jansen wrote in the Daily Mail. “And their parents, partners and friends worry too, more now than ever. …
"I am not a politician, I can’t change society, but if I can use innovative technology to improve personal safety, then I am determined to do so.” he said.