TetherMe enables the native tethering feature on all jailbroken iPhones and 3G
iPads, so that you can tether your 3G connection for free. It works by telling
the iPhone to allow tethering on any APN that is used for iPhone data. You
will not be charged extra by your carrier, as all tethering data will appear
to come from your phone itself.

TetherMe also bypasses signature checking and allows you to edit your carrier
bundle manually if you so desire. This is required to enable MMS functionality
on T-Mobile. TetherMe does NOT enable the loading of APN configurations from
.mobileconfig profiles at this time.

To tether your iPhone to your iPod Touch or iPad with TetherMe, check out the
app iTether. iTether

Это приложение доступно в Cydia (только для взломанных устройств).