I am also having this problem with ubuntu touch on my one plus one. I have installed the latest dev build with multirom. I have ATT, and when I go to "Cellular Settings" It claims that I am in a 4G zone but when I turn WiFi off I cannot access any data or make any calls/texts. When I try to access the APN settings I cannot access the menu and the settings app freezes until I close it.
I am also having this problem with ubuntu touch on my one plus one. I have installed the latest dev build with multirom. I have ATT, and when I go to "Cellular Settings" It claims that I am in a 4G zone but when I turn WiFi off I cannot access any data or make any calls/texts. When I try to access the APN settings I cannot access the menu and the settings app freezes until I close it.