You can turn off cellular data on an Android device to avoid hitting your data cap when you're not using Wi-Fi.

Wi-Fi calling routes calls over the internet, which is useful if you have poor mobile service. This article explains how to use Wi-Fi calling on Android and why you might prefer it over traditional ...

Switch this toggle on to start making calls over Wi-Fi, even when you have no phone service This article explains how to use Wi-Fi calling on Android and why you might prefer it over traditional calls ...