The best way to call Tonga from Chad is to use a VoIP service. By using a VoIP service, you can make cheap calls to Tonga and other countries. There are a number of VoIP services available, but we recommend using VoIPinja. VoIPinja is a reliable and affordable VoIP service that offers excellent call quality.To use VoIPinja, you will need to download the VoIPinja app or sign up for a VoIPinja account. Once you have registered for an account, you will need to purchase a VoIPinja calling plan. You can choose from a number of calling plans, each of which offers a different amount of minutes.Once you have purchased a calling plan, you will need to configure your VoIPinja account. To configure your account, you will need to enter your Tonga phone number and the VoIPinja username and password that you created when you registered for an account.Once your account is configured, you can make calls to Tonga. To make a call, you will need to open the VoIPinja app and enter the phone number you want to call. VoIPinja will then connect you to the person you are calling.