CNN reports U.S. Immigration and Customs Enforcement is using GPS ankle monitors and cellphones that can’t make calls or access the internet to track migrants. It is unclear how many migrants have received the government-issued phones, while 185,000 people are currently monitored by SmartLINK, the application tied to the devices. The app uses facial recognition to verify identities, capture GPS data points and more. Rights advocates said the phones raise concerns around technology and privacy.