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Along with the other comments on UDID, IMEI and MAC, I’d just like to point out that phones don’t have phone numbers.
On land lines, the number is assigned to the line that goes to your house from the local operations center; on mobile phones, the number is linked by your carrier to THEIR SIM card that you stick in your phone.
eSIM almost gets there; instead of a physical card linked to the phone number, all the logic and secrets are stored in a secure enclave on your phone and THAT is linked to the number, which is in a directory managed by your carrier. It’s linked to the phone itself because of the phone’s IMEI.
Sure, I'll change the title to say "phones have unique phone number (b/c sim cards), why don't computers have an equivalent?" I didnt mean one phone == one phone number.
With VOIP I can get phone calls even without cell service, even behind a NAT. My question is why is the network designed in such a way where that is possible, but I can't buy a static address that will persist across networks endpoint changes (e.g. new wifi connection) such that I can initiate a connection to my laptop while it is behind a NAT.
For the laptop thing you realistically could by a WAN IP per device, itd just be expensivr and also a massive security issue DMZ'ing all your devices
Cool, I'll have to look that up!