GSM iPhones come with carrier contracts from AT&T and it is a well known fact that AT&T charges heavily for all the services. Jailbreakers can easily use their iPhones in tethered mode and take advantage of the data connection. However, recently, AT&T has been sending out emails and SMS messages indicating that unauthorized tethering should not be done and users must buy upgraded tethering plan. This is once again creating discomfort for jailbreakers because many people jailbreak iPhones mainly for the purpose of enjoying tethering without being charged by AT&T.

It was unclear earlier, how AT&T was able to track down unauthorized tethering, but now, we know how this is done by AT&T. Usually, when iPhone is in tethered mode, traffic is sent through an alternate APN which is essentially A&T access point and router. This is done to identify traffic sent out as tethered data traffic. So, AT&T can easily find out iPhones that are connecting through their access point.

There are some tethering applications that use other methods to route traffic using alternate methods, but the common stock application is simple to use and it is easy for AT&T to track it. Even the most popular MyWi app uses tethering APN. PdaNet is a new jailbreak app that uses regular APN used by your iPhone even in tethered mode. This way, AT&T will not know that you are using data plan in tethered mode.

The new and updated PdaNet has a specific setting to hide usage. You have to enable this option to bypass the cunning eyes of AT&T. It seems that enabling this option will change the APN normally used by iPhones in tethered mode. TetherMe is another app that can be useful in hiding tethered mode access, but PdaNet is the best among similar apps. PdaNet can be downloaded directly from cydia and this is a truly essential app if you frequently use your iPhone data plan in tethered mode.

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