Hi. The MM6 (aka SOS) error normally indicates an inability to register to network. You could try data wiping but you will loose all user data currently stored on the device. I will suggest you phone your carrier for assistance with troubleshooting the reason while they will not let it connect to their network. Issues like this are sadly inherent in OS updating :( You could also allow it some time as some seem to affirm that a freshly installed OS can take some time (from a day to a few) to settle on the device.
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