Yes, the mobile phone side of their operations is probably quite different. I don't use a Symbian phone so I don't know anything about that, but I can understand at least one reason why they'd want to limit what can be run, and that's abuse of a given provider's network. I've heard this argument, and for the life of me, I can't understand what this argument means? How can you 'abuse' a provider's network? Is it using too much bandwidth? Well, all ISP's can limit this in any economic or technical sense they want. Let them offer limited and/or unlimited packages at their discretion? What's the big deal? Land ISP's have been doing this since the beginning of the internet. Is it the fear of screwing up the cell voice calls? I can possibly see this, but I would imagine if one wanted to do that, the technologies and radio's are already out there. And assuming it is true, leave the voice processing locked/hidden, but there is zero reason not to leave the Internet Protocol traffic completely open.
Yes, the mobile phone side of their operations is probably quite different. I don't use a Symbian phone so I don't know anything about that, but I can understand at least one reason why they'd want to limit what can be run, and that's abuse of a given provider's network.