This remains a big concern for me, as I've noticed severe malfunction of the antennas with the diptoh and the solartoh, and so did Clovis, while we have absolutely no network issues with Jolla OHs or toholed. Same observation for me in several different cities. This is something I've reported in the diptoh's thread (or solartoh's or tohkbd2's, can't remember) a few months ago, but got no real answer or testing on the matter, except another TMO member who said he didn't notice such severe network losses. As posted in the aforementioned message, I admit I'm worrying a bit if tohkbd2 is designed the same way/covers antenna areas. It seems that not all Jolla units and/or connection providers among countries are equal (Clovis and me are French, both couldn't use phone with diptoh and/or solartoh, and there are not many other active French members here who use these OHs, so we lack additional feedback). :[