Been fiddling around with my own C2 since it arrived a few days ago, and so far it’s an interesting experience. Missing the finger print sensor from the Xperia more then I expected (often one-hand use the phone while deep in mud at work), but the larger screen is nice!
I’ve noticed a few folks have issues with SMS, and been having the same issue also (Can recieve but not send, similar finnicky with setting for 4G/3G or varying the internet settings to have internet or SMS, etc etc). In fact been mildly tearing my hair out about it, but as best I can see it’s possibly a related issue as what is with the Xperia phones running SailfishOS: There’s an option on the Xperia phones "4G Calling (VoLTE) which coms up in resolutions there. The C2 doesn’t have that option to enable/disable at all. Might be something needing implementing to fix it?
Also had some issues with Android connectivity, but may be the above issue at play. I have had the bluetooth die on me a few times… though again might be the above as all connections died at once!
About the other thing I’ve noticed is a weird issue with scrolling on the browser. If you let it across using momentum, the browser will no longer accept input. It still works (plays youtube vids etc)… just… doesn’t accept input. Often making sure there’s no momentum behind scrolling (stopping the finger fully) can cause it to not trigger… but might be more to it then that. Very curious, really!
Cant use it as a daily driver yet (Xperia SailfishOS to the rescue!) due to those issues… but honestly willing to give more chances with what’s there so far!