Comment by RandomBacon
20 hours ago
It exists: just port your domain name to a new registrar, and/or point your mx records to a new email provider.
Phone number is just a user number. Email addresses are a user name at a server name. A little harder to do if you're looking for something as ubiquitous as phone number porting.
The closest thing to a server name when it comes to phone numbers, would be the network it is on. For example, there is the public switched telephone network (PSTN), then there is the Defense Switched Network (DSN)
The problem is that I would still need to "port out" my email address manually to a new domain name. It's not an exaggeration to say that there are probably over a hundred places I would need to make that change.
What's the problem? Do it during a slow day when you're bored. Doesn't take a lot of time or effort. Keep the old e-mail around for any strays that you forgot.