With the help of modern devices and communication methods, the process of dating over the Internet became as much close to the real one as possible. (victoriasagency.com.ua)
Unfortunately, this feature was removed in Android 5.0, so it won't work on modern devices. (howtogeek.com)
This is a bit different on every phone, but on most modern devices, you can get there by holding the «Power» and «Volume Down» buttons for 10 seconds. (howtogeek.com)