T-Mobile Home Internet Gateway "No USIM" error

Martha7138 wrote:

I recently just purchased the T-Mobile Home internet service but upon turning on the device at home, instead of automatically going to a software update or displaying the connection signal strength, it gave me an error saying "No USIM". At first I thought there was no sim card in the device. After checking the sim card holder, there was in fact a sim card installed. After many calls to T-Mobile's customer service team, no troubleshooting step they gave me worked. I have tried turning it on and off, factory reset, uninstalling and reinstalling the sim card, and still the same "No USIM" error occurs. After many unsuccessful attempts, I eventually just called and ordered a new sim card. New sim card comes in, not surprisingly doesn't work. At this point of writing, I am considering taking the device back to the original store I received it from and getting a replacement router. Any idea how to fix my problem before I take the device back to the store? My device is the Cylinder 5GNokia Router btw.

I could only find one other instance where someone had a USIM error, with basically no real solution given.

You said "New sim card comes in, not surprisingly doesn't work." Does that give the same USIM error?

If so, the original T-Mobile Nokia Gateway Manual mentions replacing the SIM on a USIM error.  Since you had already done that, it would appear that your gateway itself is defective, and should be replaced.