In practice, not by law. Or at least often not by law, there are some stupid laws around WiFi/broadband etc. which can be interpreted to state that it's not al

In practice, not by law. Or at least often not by law, there are some stupid laws around WiFi/broadband etc. which can be interpreted to state that it's not allowed for a phone to be sold which can be rooted (without a hack) as the user could use it to setup a WiFi hot-spot which uses non-legal frequencies. This law was made because supposedly that (with routers) is a problem, except it isn't as far as I know and it as pure lobby work from a certain industry which also loves the user to be forced to use their routers. (PS: Also country dependent.)