In Nairobi, 22 lines have been allocated and police announced on Friday that they are all working round-the-clock.
“The lines are back,” Nairobi Police chief Benson Kibui said, and cautioned users against calling the lines when they do not have emergencies to report.
“There are those who have been calling when they have totally nothing to report, they just engage the lines.”
The restoration follows public outcry and a High Court order in a case filed by civil society activist Okiya Omtatah last month.
The toll free emergency line stopped working sometimes in 1998.
Omtatah had argued in court that Kenya was experiencing high crime levels due to the lack of the toll free 999 emergency line.
“We will respond as soon as possible when called for emergencies, the public should not worry anymore,” Kibui said.