What can I do to either restore/use less MB on my iPhone?

Well I don't regularly use my internet or games that often, and I don't have that many. This message has come up before to me when I first got it, and I contacted Tesco Mobile about it. They said it was a game my brother was playing on my phone, 'Minecraft' that was using all my data. So I deleted it and it still comes up with the message. Any help on what to do please?

Monitor your usage better. There are apps you could download to do so and or depending on which version of iOS you are running could do so in the Settings to see which apps are using the most & to deny access to them from using it.

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