I have a cellphone with 25MB a month that I can use and would like to know how many KB that adds up to.

I'm trying to understand this question the best I can. Is it that you would like me to convert megabytes to kilobytes? Roughly speaking, 25.0 MB would be approximately 25,600KB. Then again, this value could be different if you have, say, 24.8MB and rounded it to 25MB. My suggestion is to study a little computer science. :)
I hope this answer was satisfactory. If not, please feel free to post any additional questions or issues. :)
