I'm currently also struggling quite a bit with AT&T.
I had the same issue as you too with multiple prepaid SIMs. The only way to solve it for me was to go to a AT&T store and replace the SIM.
If you changed your device/modem (different IMEI) it may also have this effect (no LTE), in this case you ...
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- Mon Aug 30, 2021 7:15 am
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Re: [solved] Second Modem via USB 3.0 does not work
Good deal!
I think your main issue was that you had two modems in different protocol modes. The router cannot load both MBIM and QMI drivers for the USB bus. It has to have all modems in the same mode.
Now to add a 3rd! :)
Oh good to know that have to be all using the same protocol!! Thanks ...
