DialStat is a cellular phone airtime usage tracker
Edit by : DialStat is a cellular phone airtime usage tracker for Tungsten W, Handpsring Treo 300, 270, 180, 600, and Kyocera QCP-6035 Smartphone. It also works with the Handspring Visor with Visor Phone module. It allows you to see how many minutes of airtime you have used during a given period of time. Also it allows you to see how some popular wireless carrier plan options affect your bill. (Data call duration measurement supported only on PalmOS 4 based devices.)

This program should help you to optimize your wireless calling plan. Now you can know for sure how many minutes you are using, how many of them off-peak, etc. It is designed to allow you to quickly change various options to see how they affect airtime usage. you can free download DialStat 2.9 now.