If are AT&T customer and trying to use unauthorized tethering from jailbroken iPhone by using some apps then you are in fools paradise. AT&T has started cracking down unauthorized tethering by using tethering technique employed by iOS that uses an alternate APN (AT&T access point/router). And then you will be warned by sending a notice.
Jailbroken iPhones typically use the same tethering technique as a standard iPhone, the one that’s already present in iOS. This method exposes tethering activity quite readily, because the iPhone, when in tethering mode, sends traffic through an alternate APN (AT&T access point/router) for the express purpose of identifying the traffic as tethered data. This makes it extremely easy for AT&T to identify whether or not an iOS device is utilizing tethering, and just how much of their data is consumed via tethering.
Some tethering applications for iOS make use of alternative methods and route tethered traffic through the phone’s normal data APN, but by and large, most jailbreakers stick with the stock application because it’s easy to use and doesn’t require any complicated setup. In fact, many iPhone users jailbreak for the sole purpose of avoiding AT&T’s tethering fees (for why, see next section). These are the people AT&T’s is going after.
For your kind of information that PdaNet tethering app was released by JuneFabrics with the intention that it will hide your tethering usage form carrier. This PdaNet tethering app has been updated and claimed that it would hide hide tethering usage from carrier.
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