all pdn ip connection failure

Just speculating a little more given the relationship between the SIM card and the behavior. The PDN connection is probably related to the external IP not internal IP addresses. That is where they would enforce security and controls when the node joins the network. The SIM and the ICCID provide the device/user identification for verification. The ICCID is specific to the SIM. The IMSI number is specific to the user so the combination of the two connect the device with the SIM to the user. If any of that does not add up no PDN connection will not be formed.

Sorry, just thinking it through. If the support database had a proper search engine and included data related to the error codes then the front end support people could probably go to a second level engineer and provide answers that clarify problems so users don't feel like no one knows squat. Providing info as such might be way over the top for most users but if it is relayed at a level that makes sense to the common user then it could help. I myself like to have answers to odd issues. Sort of like on the WIFI statistics why does the gateway always report "Sent Errors" on the WIFI networks? What does "sent errors" really tell anyone if no one can translate what these are?