Vodafone Pass Partnership
The mobile contract provider Vodafone has a Vodafone Pass system, that enables certain types of apps to not consume any of the contracts individual data.
There are 5 types of passes: Chat, Social, Music, Movie and Gaming
Mixer could integrate with the Social (or maybe Gaming?) pass to provide free content streaming for Vodafone costumers that pick the pass that contains Mixer.
Here is a german partner site to sign up on / check the conditions: