i posted this a couple of days ago, thought it redundant to post the same detail hereā¦ i think it will have the details you were looking for (aka i already read the manuals 3 days ago 
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Help with 4G card - canāt get any modem to show up - uConsole - clockworkpi
I even edited the enable script to restart the ModemManager service as that is needed EVERY time and not documentedā¦
Even a simple connect is not working - so its either the APN details are wrong or they are only allowing iOS and Android devices like you say.