Comment 6 for bug 1504992

@delete, thanks for the information. We need some more traces, please try following these instructions:

* Go to "System Settings" -> "Mobile" and deactivate mobile data
* Reboot so we make sure we start from a clean state
* Execute these commands from a PC/terminal after the reboot:
$ adb shell
$ sudo su
# stop ofono
# OFONO_RIL_DEVICE=mtk OFONO_RIL_HEX_TRACE="" OFONO_RIL_TRACE="" ofonod -nd -P stktest,provision,sap,udev,dun,smart,hfp &> /tmp/ofono.txt&

Wait half a minute to make sure we are attached to the network

# /usr/share/ofono/scripts/activate-context 1
# pkill ofonod
# exit
$ exit
$ adb pull /tmp/ofono.txt

and attach ofono.txt to the bug.

Reboot the phone and enable cellular data to return to your original configuration.