Is there any way to tweak a standard Calculator application in Samsung Galaxy S2 mobile phone not to display the thousands separator?
I mean to display 1000 instead of 1,000. Is somehow related to locale?
No, there doesn't seem to be any configuration to remove the digit grouping on the stock calculator app.
If you are not particular about using that very app, you can try out some free calculator apps from the market. I tried RealCalc Scientific Calculator, and it's got an option in its Settings to remove digit grouping.