Was this the only time this occurred?  As I said in the original report,
it also happened a week previously when the same person in New York
tried to phone me.  I don't have logs from that time, but there was
certainly a reboot in between.  Apart from that, I believe I have seen
this before but I can't be sure.  Those would have been local calls and
I would simply have called the person back.  But my SIM card doesn't
allow international outgoing calls so that wasn't an option in the New
York cases.

"Certain apps": I typically use gallery, dekko, terminal (which is set
to never be terminated using tweakgeek), browser, camera, settings,
contacts, messaging, phone, so those were probably "running" (although
apart from terminal probably terminated by the OS).  I was not using any
of them immediately prior to taking the call: I was expecting the call
and it was important, so all I did with the phone was check that it was
alive, running smoothly, and that the volume was turned up.

I attached two media hub log files.  Since they don't include datestamps
I couldn't be sure which covers the period of the calls.  It's almost
certainly the 2 Jun one though.  The DBus log file I'm pretty sure is
right.

Note that this phone has been switched off for a week.  I encountered
the problems.  Then I made a test call.  This failed, so I tried
rebooting the phone.  After that a test call worked.  At that point I
decided this phone was too unreliable to use and I switched to my
iPhone, which I've been using since.  After that it wasn't switched on
again until just now.

I can't use adb shell over USB.  As many people have been reporting with
MX4s, the USB port is too unreliable to use for more than a few seconds
at a time.  This is another reason I've concluded this phone is more
trouble than it's worth.  Please suggest an alternative.  I can ssh into
the phone no problems.

I've put a different SIM card in the phone and I'll leave it running for
a while.  Right now I can phone it no problem, consistent with me
finding that it temporarily fixes itself with a reboot.  The software
version is the same as it was, and I will avoid upgrading anything to
minimise the variables.  I'll try phoning again after a few days and
report back with the status.  However it's not really a comparable
environment.  As my main phone it travels with me, connects to various
wifi and cellular networks.  Also, I frequently turn on and off wifi,
bluetooth, and airplane mode as a work-around to other bugs.  And the
camera frequently mysteriously freezes so I have to terminate that.
Sitting on my desk doing nothing, I wouldn't be surprised if it works
fine.

Bear in mind that "this problem disappears after I upgrade to a newer
version" isn't really a happy ending to this story.  I need to be
reliably contactable, I can't take risks there.  If critical bugs are
creeping into a feature so fundamental to the purpose of a phone then
there's a problem with Ubuntu's development process, regardless of this
particular bug.  If you guys can show me how it was my mistake, or of my
carrier, or even of Meizu, then that's different, but at the moment I
consider Ubuntu Touch too unstable to use.

-- 
You received this bug notification because you are a member of Ubuntu
Phonedations bugs, which is subscribed to ofono in Ubuntu.
https://bugs.launchpad.net/bugs/1588127

Title:
  Phone abandons incoming call

Status in Canonical System Image:
  Incomplete
Status in ofono package in Ubuntu:
  New
Status in telephony-service package in Ubuntu:
  New

Bug description:
  I just received five incoming calls but I couldn't answer any of them.
  In each case the phone started vibrating, then after a while the ring
  tone started and the answer buttons were displayed, but before I had a
  chance to answer, the phone seemed to give up and go back to sleep.
  Then I could see the green envelope meaning that I had missed a call.

  The fifth time was me trying from another phone.  In this case it
  seemed that the line was still ringing, but again I was unable to
  answer the call.

  After rebooting the phone, I can now answer incoming calls no problem.
  So it seems this is some bad state that the phone gets into after a
  while.

  I've previously had problems with my phone's cover blocking the light
  sensor and preventing me answering calls.  However in this case I was
  expecting the call and had prepared by opening the cover, so this
  can't be the problem.

  Phone is an MX4.  OS Ubuntu 15.04 (OTA-10.1).

  FYI, this was a job interview, with a CTO who was phoning from New
  York.  I'd already had to delay a week after missing the first
  appointment due to the exact same problem.  I've been barely
  tolerating Ubuntu Phone's bugs up to now, but this is the final straw.

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