Android-Do I Use Minutes On My Phone
From PhonePower Knowledge Base
Do I use my minutes on my phone?
The Android application has two operating modes, one of them can use data on your phone while the other does not.
Prefer Wi-Fi
This mode uses your Data plan or Local Wifi connection to make and receive calls, this does not touch your cell phone minutes.
Wi-Fi Only
This mode uses only your Local Wifi connection to make and receive calls.
