Teammate Kevin Kuranyi also headed against the post in the first half, while Mohamadou Idrissou nodded against the bar for Freiburg , who ended a four-game losing run to move up to 15th.
The Bluetooth-enabled device could have kept the Apple engineer from losing his iPhone in a bar a few weeks ago, obviating a legal tussle between Apple and the tech blog Gizmodo, which published unauthorized photos of the phone.
Button, who wanted to switch to Williams for this season but was forced to stay at BAR after losing a legal dispute, was especially critical of engine partner Honda, the team's co-owner.