@ut Reading again the OnePlus 3 forum posts, this looks like a problem of the 3T(?). My OP3T is A3003. Just installed e.foundation and no incoming call volume sound problems. In the past had Lineageos on this device and also no problems.

Just installed UT on OnePlus 3T: OTA-23. Appears to work fine except for incoming call volume as others reported before. Not really usable this way ... :-(.

@pranishres Great video. Successful install on OP3T A3003 (Europe model) with ubports-installer 0.9.7-beta. Had to switch Cellular Connectiontype to 2G/3G to receive calls. On T-Mobile in The Netherlands.

Same kind of problem on Nexus 5 OTA-12. Alarms and buttons suddenly got grayed out. Restart did not change this. It was not possible to swipe and access the delete checkbox. Solved this by creating a new alarm. Then I could swipe this new alarm, select all alarms and delete all alarms.
Never had any problems with the alarms before.

@ut yesterday again had the same problem: no Wi-Fi button in System Settings -> Wi-Fi. It appears there is also a Wi-Fi button in System Settings -> Battery but toggling this did not appear to change anything (but maybe i am inpatient). Discovered another Wi-Fi button in the top (notifications) bar -> Network. Switching this to On gave me Wi-Fi again and the Wi-Fi button magically reappeared in System Settings -> Wi-Fi.

@MarkG_108 had the same problem mentioned in the first post: System Settings -> Wi-Fi only shows "Previous networks", no Wi-Fi button. Also dekko2 crashed when I tap on a mail subject in the list to open. Dekko2 had been running fine before, although sometimes I had to restart the phone.

Never saw this before and restart did not solve the problem.

I had three apps installed: dekko2, sudoku js (played often), fishy shooter (never tried this). It appeared sudoku js suddenly had disappeared.

I uninstalled dekko2 and fishy shooter, restarted and the problem was gone: System Settings -> Wi-Fi showed the Wi-Fi button again ... magic ...

Running Ubuntu 16.04 (OTA-12) on OPO.

Does anyone know where are the DNS server settings (cellular) and how to change/set them to servers of own preference? Thanks.

Update 15 Nov 2019

To check the DNS servers used you can use nmcli (using adb shell):

1. Get devices

nmcli d

Result on my phone:

DEVICE  TYPE      STATE        CONNECTION                
ril_0   gsm       connected    /204163554125122/context2 
wlan0   wifi      unavailable  --                        
sit0    iptunnel  unmanaged    --                        
lo      loopback  unmanaged    --                        

2. Get device info:

nmcli device show ril_0

Result on my phone:

GENERAL.DEVICE:                         ril_0
GENERAL.TYPE:                           gsm
GENERAL.HWADDR:                         (unknown)
GENERAL.MTU:                            0
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     /204163554125122/context2
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
IP4.ADDRESS[1]:                         178.227.211.124/24
IP4.GATEWAY:                            178.227.211.125
IP4.DNS[1]:                             84.241.227.81 <=== T-Mobile DNS server
IP4.DNS[2]:                             84.241.227.82 <=== T-Mobile DNS server