iOS has a remote erase feature. Its also a leaked video and doesn't show which version or model. So it could be something that is already patched, or soon will be. Remember to always keep your OSes update.

The first thing the authorities know to do is put your phone in an RFID bag/enclosure so it can't talk to the outside world.

It's a bit difficult to remote erase your phone while you are in custody.

Unless you are Norwegian royalty and are notified of your upcoming arrest, then you can wipe all you need.