Its not wireless tethering, its via usb and requires you to install client side software on the computer you are trying to tether to. It works by setting up a local ip address on your machine and redirects traffic through your phone to that ip. Essentially it turns your phone into a proxy server but rather than redirecting traffic over the Internet to your computers ip, the traffic is actually redirected through your usb cable and communicates with the open local port at the address the client side software sets up for you.
As far as your carrier is concerned, I don't think they have any way of telling who uses it besides an educated guess based on a user's relative monthly data consumption in comparison to the rest of their customer base; since the data isn't actually being broadcasted as a wireless network but rather routed through your devices mini usb port to a local address, from their end it probably looks no different than regular data usage on your device. They are however able to track which users are wirelessly tethering without paying for the plan because they can just send out simple data packets to peoples phones and pick up the differences in the way its transmitted. Tethering without pay has become a major problem for the service providers because people are using it excessively and oversaturing the network, forcing them to either take action or spend a ridiculous amount of money on building more towers. Businesses usually will always take the least expensive solution to tackle a given problem so I really wouldn't be surprised if people who are using data excessively start receiving C&D's in the near future.
I am not your service provider so I really don't care, but please note that the more people who tether without a plan, the more likely the service providers are going to become less customer friendly and start cutting back on all their promotional offers and beneficial policies for end users. Tethering is fine in my opinion because from a technical perspective its really no different then regular data usage, but to the same extent some people have really taken this to the next level and use it as if it were their home isp. Regardless if your plan is "unlimited" just be aware that if your service provider had it their way they would want you paying an additional 20 per month for a measly 2GB of the same data... so users who are pulling down 100GB+ are technically getting away with not paying $1,000 worth of service every single month.. I think that by those calculations its pretty easy to see why the service providers are pissed off. Moral of the story is do whatever you want but maybe consider exercising a little discretion.... lol.
To answer your questions, you can't use PDAnet to tether to a ps3 because it requires client side software. You would need to root and wirelessly tether (or actually pay for the service... lol).
Also, I am pretty sure with a little ingenuity you could use the free version along with a VPN and be able to access https web addresses... but then you would be effectively avoiding to pay for an app that's made to help you avoid paying for service..LOL .. that's probably the lowest you can go if you have any guilt about any of this... lol. But on a side note, setting up a VPN along with PDAnet would probably hands down be the number one safest way to tether. There literally would be absolutely no way for them to detect that unless they were able to access your google account and see that you made the purchase... but even then, who said that you can't buy an app? What if you never use it? Unless the service providers have some sort of new sophisticated technology that I am not aware of and are actually going through the trouble and expense of implementing something like that then I think it's safe to say that VPN + PDAnet would keep you off their radar for a long time. Good luck.
Hope that helps.
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