[MM - plugin] Network mode change support on Netgear AirCard 340u.

[Dan Williams]

On Wed, 2016-04-06 at 10:49 +0200, Aleksander Morgado wrote:
> On Mon, Apr 4, 2016 at 11:13 AM, Jarosław Bielski <bielski.j at gmail.co
> m> wrote:
> > 
> > > 
> > > Could you gather debug ModemManager logs while the capabilities
> > > are
> > > set to "gsm-umts" only? Get the modem registered in the network
> > > and
> > > connected, while getting the logs, please. We should see what the
> > > modem replied in each of the commands we send.
> > It seems that setting mode to 2g only failed because the modem had
> > set
> > current bands to u2100 - I did not catch that band selection is
> > "non
> > volatile", it is obligatory after boot up/power on. After changing
> > current
> > bands to any I am able to switch the mode to 2g (the modem shows
> > EDGE
> > indicator on embedded LCD).
> > 
> > I am not one hundred percent certain if mode 2g|3g with preferred
> > none works
> > correctly, because modem shows that it uses 4g. I have attached
> > logs from
> > two steps:
> >  1. setting mode to 2g|3g, preferred none
> >  2. connecting to the network by single-connect
> > 
> > Thanks for the tips. I really appreciate your help.
> Thanks for the logs. Both show that the modem ends up always in 3G,
> never in 4G, so I think ModemManager is actually doing the right
> thing. No idea why the LCD would say 4G :)

It might depend on the variant; the 340U in the US was primarily an
AT&T device.  And AT&T is well-known for calling HSPA "4G" and making
their devices show the same thing on-screen.  They call LTE "4G LTE" to
distinguish it from HSPA and DC-HSPA.

"4G LTE devices limited to 4G HSPA+"
https://www.att.com/esupport/article.html?_escaped_fragment_=/wireless/
KM1008736#!/wireless/KM1008736

Just a possibility.

Dan