iOS6 cellular data usage

[mentaluproar]

I love my navigon app on my iPhone 4s, but I have to admit, telling siri to take me somewhere sounds nice. My concern with this, however, is about data usage. Some GPS apps fetch their maps as they need them, over the air. This can be problematic in 2 ways: getting lost in a dead zone and eating up your data plan. FaceTime will likely be a monster on data too.

Does anyone here know if there is some sort of exemption on data usage by these apps?

 

[mrsir2009]

Don't know any exact numbers, but in my experience with using Siri with 3G it hasn't used very much at all. The voice is compressed a lot, so it doesn't use at much data as you'd think.

 

[iBram15]

Siri over 3G doesn't use that much, I remember seeing somewhere that FaceTime over 3G would use 14MB per minute.
Maps could use a lot of data, but I think Apple has found a way to reduce that!