省CallCall (free)

準確分析通訊錄&各通電話為網內、網外或市話用戶

第一類電信業均可正確分析(np過後也可準確判斷)
-中華 台灣 遠傳 亞太 台灣之星

結合Skype通訊軟體，連結聯絡人
撥號時，如該聯絡人以連結，
顯示詢問視窗是否改用Skype網路通話

付費版享有更多實用功能!!
請前往查看
https://play.google.com/store/apps/details?id=tw.piggy.savecallcallfree Accurate analysis of each outer and inner contacts & phone to network, network, or local subscriber

The first analysis of the telecommunications industry may be correct (after np can be accurately judged)
  - China and Taiwan Asia Taiwan Far EasTone Star

Combined with Skype communications software, links contacts
When dialing, such as the contact person to link,
Window is displayed asking whether to switch to Skype Internet calling

The paid version to enjoy more useful features !!
Go to View
https://play.google.com/store/apps/details?id=tw.piggy.savecallcallfree