We've pointed to a bunch of stories that involved Apple somewhat arbitrarily forbidding or banning iPhone apps, but now it appears that the courts are getting in on the game as well. A German court has banned a VoIP iPhone app after T-Mobile, the mobile operator who offers the iPhone in Germany, complained. The court says that this VoIP app "makes use of unfair business practices," though it's difficult to see how. VoIP is a perfectly acceptable application, so why is it unfair? The court's explanation here seems a bit stretched as well. Apparently, the only way to run this particular VoIP app is on a jailbroken iPhone, and T-Mobile's contract forbids jailbreaking the phone. Of course, if that's true, isn't it an issue between T-Mobile and its customers who broke the contract? Why should the app maker be blamed? All it did was build a useful app? This seems like yet another case where a company is arguing that interference with a business model should be illegal.