I want to know details about IMEI numbers are used, be it for networking or blacklisting etc - the tech stack behind it.
I went over to Network Engineering but I'm not sure if that's the right place.
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If the question is about settings, then the best place would be the ISP directly, try the customer service for example.
If it's about ISP in a different country if you are travelling there temporary, then Travel.SE is the place, we have plenty of these questions there.
If it's about network related stuff such as port forwarding, triggers, etc., then Super User is the place, not Network Engineering for sure.