Currency Format change in the Device, Why?

I am using XCODE 4. In My app I am using NSCurrencyFormatter Code...

    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
 [formatter setNumberStyle:NSNumberFormatterCurrencyStyle]; 
  ... = [formatter stringFrom开发者_如何学GoNumber:number];

Problem is On Device Instead of $ it shows RS. In simulator it works fine with $.

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I just need to change the iphone setings.. Settings --> General --> International -->Region Settings to Whichever country I need to make. Then My currency will set on Iphone according to this..