You may be able to check that by reviewing FCC documentation online similar to how people sleuth out new phones, though I've never looked at what precisely is required in terms of filing.
> maybe cellular networks
Now you're getting me paranoid.
That would probably cost too much. At least I hope so.
Amazon used to provide free networking for its readers... I think that it is very cheap to transfer text/"meta-data"... It might even be sponsored by the government...