There's two angles here which might make a difference in the legality of it: a) Apple turns it off on behalf of the carrier -> Apple is free not to offer this

There's two angles here which might make a difference in the legality of it: a) Apple turns it off on behalf of the carrier -> Apple is free not to offer this feature to you b) The carrier is blocking it without help from Apple -> The carrier is limiting what you can connect to The latter might be a breach of contract / telco laws (e.g. net neutrality) - depending on your jurisdiction / local laws.