U+ Call Assistant is a free smartphone app that allows you to make free calls with your smartphone. It supports the latest Android devices and is compatible with almost all smartphones.

It has a simple and user-friendly interface that will allow you to make calls and send texts to your friends and family with a simple tap.

It can be used as a call-waiting tool as it can let you listen to your voicemails.

The app also supports text messages.

Download and install this from Google Playstore.