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[Tony Espy <1461593@xxxxxxxxxxxxxxxxxx>]

Thanks for the log @Victor.

So the smoking gun is:

Jun  4 14:26:41 ubuntu-phablet NetworkManager[1408]: <info> Disabling
autoconnect for connection '/214040113340577/context2'.

There's only one of these in the log.  When this happens, NetworkManager
has seen a disconnect for the modem, but hasn't yet seen the signal that
the GPRS has de-tached ( which is what should happen when you change
radio technology ).  In this case, NM retries the modem rapidly, and
burns through the autoconnect_retry_count for the connection.  When this
count reaches zero, NM sets a 5m timer to reset the retry_count and try
again.

This is indeed similar to the bug #1418077 ( FixReleased ) and bug
#1445080 ( InProgress).  I have a partial fix for the latter bug which
may resolve your specific scenario.

One question, do you wait for the network-indicator to show the mobile
connection is active before switching the radio technology from 3g to
2g, and back again?  I see the connection coming up in the syslog, but
it looks like the technology gets toggled again before it's completely
finished.

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Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1461593

Title:
  No data connection switching from 2G only to 3G

Status in network-manager package in Ubuntu:
  New
Status in network-manager package in Ubuntu RTM:
  Incomplete

Bug description:
  Test case.
  - Open System Settings.
  - Go to Cellular.
  - Switch from 3G to 2G, check that indicator network shows 2G only connection.
  - Switch from 2G only to 3G.

  Expected result.
  - Indicator network shows 3G connection, and user can use data connection.

  Actual result.
  - Data connection is lost.

  Tested in single SIM and dual SIM mode, with two different SIM cards
  from different operators.

  current build number: 23
  device name: krillin
  channel: ubuntu-touch/rc-proposed/bq-aquaris.en

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