Siri data plan usage per task?

Good question. I've not heard anything related to data amounts used for Siri.

 

I also wondered about this since during congested times, Siri has been having trouble connecting to the network.

Us in the US are on tiered data plans so I will wonder how much data Siri will be using.

 

Since SIRI connects to a remote network to do anything, it's the same thing as you going online with your phone. It will use up data if your not on wifi. I don't think it uses anymore than if you were to use Google app. Do a test...go to Settings>General>Usage>Cellular Usage and mark your Sent and Received amounts. Now start using SIRI for a few things (make sure your not connected to WIFI). Then go back and check your Sent and Received amounts. This should give you an idea of how much data SIRI uses for you.

I did a test on mine, asked what 4+4 was, asked a how tall a building was (which did a web search and pulled up google listings, but I didn't click on any of them), asked the easter egg questions, and asked a question about the 4S (SIRI wanted to do a web search, but this time I didn't let it), told SIRI it sucked (which it doesn't for the most part ;-)), replied back with "I respect you", I said "as you should", replied back with "I don't understand 'as you should'". All this used up 250KB (Sent) and 378KB (Received).