T-Mobile registration trouble (USA)

[matthew stanger]

>Code that was working back in July isn't working, and our IT
> folks gave us new SIMs from T-Mobile. Here in the USA, T-Mobile has
> instituted a requirement that a SIM be bound to a specific IMEI. I am
> using the ModemSimple.connect call to connect, and I keep getting a
timeout.

If you are on a business account or certain MVNO this may be true. If you're
APN really is fast.t-mobile.com though, then there is no IMEI locking. I'd
ask
your IT dept to confirm your APN first off.

On Fri, Oct 21, 2022 at 1:11 AM Aleksander Morgado <
aleksandermj at chromium.org> wrote:

> Hey,
>
> > After something of a hiatus induced by work priorities, I am back to my
> > project that uses ModemManager and a "glue" program to tell it to
> > connect. Code that was working back in July isn't working, and our IT
> > folks gave us new SIMs from T-Mobile. Here in the USA, T-Mobile has
> > instituted a requirement that a SIM be bound to a specific IMEI. I am
> > using the ModemSimple.connect call to connect, and I keep getting a
> timeout.
> >
> > Using mmcli, I run this command and also get a timeout:
> >
> > $ mmcli -m 0 --simple-connect='apn=fast.t-mobile.com,ip-type=ipv4v6'
> >
> > My boss is getting the same thing with a different modem and SIM. Both
> > SIMs have allegedly been paired with the IMEI in T-Mobile's records.
> >
> > Does anyone know if simple-connect still works with T-Mobile in the USA?
> >
>
> Yes, it works. There are daily tests running automatic connections to
> T-Mobile and other major carriers in the USA and other countries.
>
> Are you sure the "fast.t-mobile.com" APN should be used? Maybe your
> new SIM cards require a different one like e.g. "wholesale"?
>
> What is the output of "mmcli -m a"?
>
> Also, try adding --timeout=300 to the --simple-connect call.
>
> --
> Aleksander
>
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