VON was established back in 2007, but their cause is coming to the spotlight once again. An example is German T-Mobile, which blocks users from making voice calls through Skype's application for mobiles over their data connection. Yes, you can still use Skype via WiFi on a T-Mobile iPhone, but the block definitely limits consumer choice.
On the other hand, T-Mobile claims that this extra traffic will leave an impact on their network's performance. Now, when we're talking about net neutrality, the ISPs are claiming the same thing, but it's a bit easier to believe the mobile carriers, because a lot of 3G phones transferring data from one cell tower actually do hinder cellular network's performance.
Now, the European policymakers need to decide who's right, but simply blocking applications you don't like never seems like a good solution. Especially if you're offering your customers a device (iPhone, BlackBerry, Android) whose attractiveness largely stems from the applications you can use on it.
Additional VoIP Resources from Mashable