When I press the only Update button I see on the screen, I get an error per the attached screen shot. However, at least it now seems to be defaulting to GSM/LTE, which is fine.Sorry I didn't read it back. I think maybe you need to press Update button after changing
I did a bit of research as saw where that SMSC entry is for messages. I updated with the proper number. That doesn't affect the network setting though, which appears to switch between GSM auto and LTE/GSM auto (maybe depending on if it's picking up a 4G signal?).
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