Re: Enabling LTE

[Dan Williams <dcbw redhat com>]

On Tue, 2019-10-22 at 19:47 +0200, Bjørn Mork via networkmanager-list
wrote:
> Marc Murphy <marcmltd marcm co uk> writes:
>
> > If I swap to a 3G antenna on mPCIe modems it will connect first
> > time
> > on 3G.
> >
> > My main query is that why can an iPhone connect and us the 4G
> > signal
> > and the multiple modems not ?  ZTE ME3630 E1C mPCIe
>
> The main difference I can think of is that LTE registration depends
> on a
> default bearer.  You may have to configure an APN and context type
> for
> this.  How to do that on a modem is not well defined unfortunately...
> You could try configuring context ID #1. Use the APN and context type
> that works on your phone.
>
> But I guess ModemManager already should to this, so the problem is
> probably something else...

My other thought was that if the modems are QMI then perhaps the band
mask is misconfigured to ignore those bands, even if the hardware is
capable of it?

Even if they aren't QMI then if they have an AT channel there may be
vendor-specific commands to read the enabled bands.

Dan

> Anyway, no harm in testing. Use a terminal program connected to the
> AT
> command port:
>
>  AT+CGDCONT=1,"IPV4V6","APN"
>
> Or start ModemManager with --debug and run
>
>  mmcli -m 0 --command='+CGDCONT=1,"IPV4V6","APN"'
>
>
>
> Bjørn
>
>
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