Which cellular data output are you referring to?
just interested, David L
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Hi David, I don't have a data plan with my mobile plan and I noticed I was getting hit for $2/Mb of data downloaded by some apps I had installed, e.g., A-GPS data, Google adverts, apps that wanted to connect to the internet, etc., all via the 3G mobile network.
Turning off Cellular Data in Settings has stopped that. The GPS is slower to get a lock, some apps don't work properly, etc. but I can live with that but it's saving money as I'm not using the mobile network to download or upload data.
I updated my 3GS to OS4 and at first it ran like crap...then they brought out another little update to OS4 and it runs great now. Definitely do it!