You can charge (purchase) points as follows.
Point Charging (Purchase)
in SkyPhone > "Point-Paid Calls (for Users)" > "Charge Points" and and select the amount of points you would like to charge.
Note: The points are available on the iOS version only. You cannot move the points to other OS.
You can see the charging history as follows.
Point Charging (Purchase) History
in SkyPhone > "Point-Paid Calls (for Users)" > Tap "Point Charging History."
Note: You can see the past 20 charges or the "No history." message.