In my brain this seems like we are going a bit backwards if you have to contact your carrier each time you want to switch phones. I guess it's only a problem for people who have multiple phones are switch often. Seems like we are going back to the days when I had to call into Cingular to get my new sim to work in my phone. Is the only benefit of e-sim the fact that you can use 2 lines now? Which is the same as having a dual sim phone? Maybe I'm missing something.