Please keep up your reviews, analysis, debugging and nice-to-have lists but this has been discussed already (you can also search for FCC in this forum to find a link to U.S. Certification docs and more PDFs than you want to read):
What Does Offline+ Mode Actually Disconnect?
Now, I will agree that perhaps the marketing slicks didn’t quite match the actual reality of the phone, but so far I have not taken a sledge hammer to my Kompakt (and no, if there were insurmountable issues, I would not sell it to some unsuspecting soul–bad karma).
From the slick (User Manual):
3. Offline+
Gain focus and tranquillity while ensuring privacy and zero radio frequency emissions by disconnecting the antenna and microphones
and disabling the camera, WIFI and Bluetooth.