Make free call on Facebook

It's a cool feature on facebook messenger {you may need to update} that allows free calls that don't eat into your precious credit - just data if you're not on Wi-Fi. There are other solutions such as Skype and Vonage, but Facebook has all of your friends in one convenient place.

Initiating a call is easy by just tapping the "i" button in the top-right corner of chat with another user. The user on the other end will receive a push notification to accept or refuse the call. If your contact doesn't have Facebook Messenger open or lurking in the background of their device, you can leave them a voice message to pick up later.

It's worth noting calls can be made cross-platform, Android to iPhone, or vice versa.