

From the phone manufacturer, it’s fewer traces and less mechanical design work.
From the carrier side, it requires you to have their spyware installed to register the Sim
From a user perspective, someone can’t just steal your Sim and put it in another phone


Then you are using a feature phone, or a standard Android/iOS device with their tools preinstalled
If you try to use it with a free operating system, it’s not possible.
Here are the instructions for installing the bridge code on Graphene: https://grapheneos.org/usage#esim-support