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If you’re having trouble, you can try going into bypass and checking the operator profile directly on the u-blox: send AT+UMNOPROF?
It should reply 3 (matching up with the CP value). If for some weird reason it doesn’t, you can change it by first disconnecting from the network, changing the profile, and then restarting:
AT+CFUN=0
(OK)
AT+UMNOPROF=3
(OK)
AT+CFUN=1,1
(OK, then a delay and possibly a junk character or two on restart). The setting should hold when you go back into Transparent (and the Digi software will register the change).
Shannon and I were just talking about this – the Hologram SIM’s just really prefer AT&T. Verizon gets written the the FPLMN list really fast. It appears there as 311480.