Summarize this article:

If you are calling a friend or family member, see if they are willing to video chat with you instead. There are many applications that offer this service at no cost to you. In order for the call to connect, both you and your friend will need to have the application installed on your mobile phone or computer and add each other as a contact. Press the person's name in the app to start the call.  Popular video messaging apps include Skype, Snapchat and Facebook Messenger. It is important that both you and the receiver have good Internet connections, otherwise, the call will cut out. This isn't a good option if you are trying to call a business or organization. Place a regular phone call instead. Audio calling uses the same technology as video messaging, but the camera is disabled. This option works well if your Internet isn't fast enough to load the visual connection when you make video calls. Both you and the receiver will need to install the same audio messaging app for the call to connect. Add your friend as a contact and then press the person's name in the app to connect the call.  Snapchat,  Viber, and Facebook Messenger are popular audio calling apps. Download your chosen app onto your phone or computer. Voice Over Internet Protocol (VOIP) apps allow you to call overseas for a cheaper price than many phone companies. Unlike video and audio messaging apps, VOIP allows you to place your call to a landline or mobile number.  VOIP applications are offered by companies such as Skype, Viber, and Google+Hangouts and can be downloaded onto your phone or computer. Dial the full phone number, including all the codes, when making the call with a VOIP provider.

Summary:
Talk via an online video messaging app if you have a strong Internet connection. Place the call via an online audio messaging app if you want to talk for free. Make the call with a VOIP provider to reduce the charges of the call.