how to set a mobile data limit on a lg optimus S i need dummy intructions carrier is Sprint?

Being a spring customer you still might be able to text Sprint and it'll bounce back with stats as of that date. See this link and use Sprint Zone app. Thinking you can put limitations on account via mobile this way--like a text alert if you are running low.

http://www.sprint.com/landings/mysprint/index.html...

I'm not certain it comes with a data counter like and iPhone but you can also download one from the Google Play store. I recommend setting it based on your billing cycle for best/accurate results. Best luck.

https://play.google.com/store/apps/details?id=com....

http://mobileoffice.about.com/od/wifimobileconnect...