During the "migrant waves" a few years ago (2015+, when angela merkel invited them, then left most of them "outside"), our telcos actually gave out free sim car

During the "migrant waves" a few years ago (2015+, when angela merkel invited them, then left most of them "outside"), our telcos actually gave out free sim cards with a few gigs of data traffic as a "gift" to migrants, and there was a lot of complaining since noone figured out that those can be used for tracking those people, both in my country and also other EU countries, wherever they went legally or not.