Iphone Data Usage with GPS and Runkeeper

This is my first Smartphone and I have 1GB of data per month as part of my contract. If I were to use the Runkeeper App to track my training, can anyone who has used it tell me how much data it uses. Alternatively, is there a way of keeping track of data usage in general?
Cheers Guys
Cheers Guys
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It says you can alter the the phones APN (access point name)
1. goto settings>general>network>cellular data network.
2. You'll see what looks like a web address. Dont delete it, just change it to something meaningless by adding an x onto the end of it.
This will stop the phone being able to download mobile data; wifi and voice calls are not affected.
momentarily from the herd and thinks for himself.