Fido cellphone question?

Ok so i got a new phone today and am a little bit confused on what the fido credit limit is, if anybody could explain that to me please.
I might be understanding it wrong does that cost me money everytime i use some of it? or is it a cap and if i use all of it and go over it then does it start costing me money? If anybody can answer that'd be great thank you
 
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