When they arrived in Ciudad Juárez on 17 March, across the US-Mexican border from El Paso, Texas, Nestor Quintero and his family were penniless, hungry and homeless. But their primary concern was getting their hands on a smartphone.
The 35-year-old Venezuelan migrant had found out in Tapachula, a city close to the Mexico-Guatemala border, that people hoping to enter the US to ask for asylum needed to secure an appointment through a recently introduced mobile phone app known as CBP One.
