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"The Email and Web for BlackBerry and Email and Web for Smartphone Features are designed for personal, consumer use and are not compatibleBlackBerry Enterprise Server, BlackBerry Desktop Software, Wireless Sync or Wireless Sync Enterprise Server or Good™ Mobile Messaging. These features cannot be used to tether your device to laptops, personal computers or other devices for any purpose other than syncing of data; any other use is not permitted using these features. Service is only available in the National Enhanced Services and Extended National Enhanced Services Rate and Coverage Areas. with some Internet email service offerings or with email applications utilizing"

These features cannot be used to tether... not permitted using these features.

Can't tether to use these features (Blackberry, wireless sync, wireless enterprise, modbile messaging). No problem there, I wont use tethering for those features. And syncing of data is technically what tethering does, so I'm good there too. So from how I read it, I can tether just fine on the $30 plan.