New job, location
new car :-)
Join Date: Nov 2009
Location: United Kingdom
I've got the Lumia 920 but got the unlimited plan so not sure what my usage is. Make sure that if you have other settings like photo uploads on, they are set to wifi only. It's also worth stopping background tasks or turning the data connection off unless you want it as suggested above. Data usage is one of the benefits of most smartphones but if you have a wifi connection available, use that and just turn it on for e-mail checking occasionally when no wifi available. Having said that, I'm not aware of it being any more data hungry than most other phones (be aware if there are any phone software updates that you only use Wifi as they can be quite big). We get lots of calls about the Galaxy "Ace" running out of memory, but most 520 calls are setup calls as they are just learning the system.
Having re-read the above, I assume e-mail isn't a priority on it then! Turning off unwanted features will also benefit battery life.