Tuesday, December 23, 2014

When marginal price of a call goes to zero


Having an unlimited mobile plan is a very nice thing - you do not need to worry you will pay more than you expect for using your smartphone.

Also, at some point (often quite early in a month), successive calls become free.

Or to be precise - the marginal price of a call goes to zero.

Still, I was wondering, how much of the unlimited am I actually using.