Hello all!

I have a question, I have a registered Phantom 4 that I want to lend to a friend for a trip in Iceland.
Is it allowed just with the DJI app? Is it going to work without registering the drone on a new DJI account?

Thanks in advance
Davide

Yes, your friend can use it and it will work, he just has to install the GO app on his device and create his own account if he wants.
I don't know about the laws there with another operator other than you using it but I'd guess it's fine but where he's travelling to (Iceland) would be a question for them.
As far as the aircraft working, yes it will still work.