Does seem that most apps expect a 24/7 connection. As I said before I only use about 60-80mb a month and never turn 3g off so long as you don't have any apps that hog data in the background you shouldn't have a problem leaving it on for getting email, facebook and forum notifications (all I really use my phone for... oh and tapatalk
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There are also lots of apps to manage data. Warning when getting to a certain usage, turning off at another set amount. Turning on for short periods per days etc. Have a search round and you might find something that suits your needs.
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