My iPhone is eating all my credit when I, m bot even using it?

I just bought an iPhone 4 and a lyca which had $10 dollar credit… I check the balance it is now 87 cents and i did not even use it so please help

Added (1). Exactly apps chew up credit, even while playing game and my Wi-Fi is turned of some advertisement pops out, I guess it use my credit

Give it something else to eat.

Nah, seriously just turn off your background data or turn it right off when you're not using it. Apps chew up heaps of credit…

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