Changing the visual look of the text fields to actually look like text fields is all you need to do, no documentation required.
Now that I realize that entire screen was "settings". Closing the UI is not a setting. There should be a persistent button for that (and for just minimizing qgvdial) much like some of the other fullscreen maemo apps.
Putting the proxy settings and mosquitto settings all on that main settings page would probably be good. All of the buttons could use some spacing on all screens, especially "logout" so one doesn't accidentally click that while doing something else.
Refresh and about aren't really related to settings. I would suggest finding a different way to represent them. One would be refresh buttons like I recently did in Dialcentral.
Also, refresh I take refreshes everything? Usually I find I only want to refresh missed calls or voicemail or texts and waiting for a full refresh seems wasteful.
Wow, a contact has a "close" button and the "back" button. Oddly enough "close" goes back one level" while "back" goes to the main screen. On the dialpad when selecting a call method, it isn't clear that some are call-in and some are call-out, I had to think about that for a bit "oh, this is downloaded from gv while that is from my telepathy".
When I call a contact, what call method is used? What I configured on the dialpad? That then sounds like a settings that belongs right below the login buttons or it should be available wherever one may call.
On "inbox" the category touch selector isn't too obvious at being a touch selector.
On voicemails I didn't notice it was downloading and got two play dialogs. And for some reason it wasn't playing for me. Any reason you don't show the voicemail text? Odd that I only show text while you only allow playback
For sms, you only seem to be showing the last message the person sent rather than the whole conversation.
This is probably from the mixture of qwidget with qml but closing of the text writing window should automatically go back to the main window rather than using the task switcher. Is there not a way for one to be a subwindow of the other?
For the most part, with some good UI you won't except for how do I setup a mosquitto server since that is unrelated to direct use of the application. I tried clicking that. The click target is unclear and kind of small. Only knowing that yes that is what I need to click did I actually click it. Also knowing that on the first screen that I need to go "back" is confusing as I saw nothing to go "back" to. Maybe popping up the main screen and then sliding to the login screen would help with that.