I had the tethering hack set up for my now old iPhone 3G. And had backed up before I went and bought my new iPhone 3G S. Unfortunately, after i restored from the backup to my new phone, tethering is still there but I am no longer able to use the Visual Voicemail feature. Can someone else replicate this problem and perhaps find a solution? Even if it means getting rid of tethering I just want to get visual voicemail back and working. Thanks!