If your iPhone and Mac are on the same WiFi network, it is possible to turn your Mac into a phone to make and receive calls from your Mac via your iPhone.
You have probably received an anonymous phone call with a pre-recorded message before. Robocalling is a prevalent nuisance. Find out how to block robocalls here.
Want to save a number during a call on your Android phone? This app lets you note down phone numbers easily during a call; it substitutes for pen and paper.
With the Continuity feature in iOS 8, you can now make phone call on iPad/iPod Touch even though it doesn’t have a celluar connection. Here is how you can do so.