Skyjumper,
Jolla packaged the phone very well. They put the phone box inside a much bigger box. I would say it almost doubled the size of the package. I am also pretty sure that you could ship it safely in a slightly smaller package, but this might be hard to negotiate. I mention this because DHL said the volumetric weight was 0.52kgs. You would save some money if it was slightly smaller.
For the record the package shipped from Jolla via FedEx.
Dimensions: 20x13x9cm & 0.5kgs
It then shipped from Forward2me via DHL.
Dimensions: 20x13x10cm & 0.4kgs & 0.52kgs vol weight.

Hope this helps. Good luck.