Reigstration problem

[Smokehead]

Do anyone know why I need to register the mavic when start to use is in china? It's bought in Hong Kong activated and registered there. Now in china when I start it ask for registration and when enter my phone number it says is invalid.

 

[Smokehead]

Found it out myself. There is a new law in china since June this year that it must be registered in china. And today was the maiden flight