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Simply move the slider up so far that you will never reach that amount of data This slider indicates from how much MB of data the warning gets to be displayed. In this diagram, there is a horizontal orange slider. Here you can see a diagram of the process of your use of data.If you want to get rid of the symbol and the warning, you simply have to set the limit to an amount that is so high, that this value is never reached and so, the warning is not displayed. Roughly said, this warning is displayed in the case your mobile data has exceeded a certain amount. What that is exactly, you can read in the question regarding the data usage warning. In your case, that is the data usage warning. The symbol "triangle with exclamation mark" in the status bar is a common symbol for a warning.
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