How to cut back on iphone data usage

I've got a text saying that i've used 65% of my data usage on my iphone. How can i cut back on my data usage? What uses a lot of data? Is it imessage? Or just a lot of apps(don't even have that many apps).

Do this
Settings>General>Cellular>Turn Cellular Data off [ This is what lets you use the iPhone internet ]

My iPhone plan allows me to have $350 of calls and infinite text and 500mb of data each month
I never go over because I just text a lot and have Wi-Fi at home!
They told me iMessage doesn't use a lot of data it's more apps - social media apps etc
When your not on the Internet I suggest you go into settings, general, cellular? Then turn off cellular data and 3G (if you don't already do this)
This uses battery life very quickly and data…
When you need the Internet turn it on:3 but when I'm out and not using Wi-Fi I just use my free text rather than iMessage

Try using different browser… Safari eats lot of data…
try opera mini.

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