If you currently have a landline phone service, or are considering signing up for one, here’s what you need to know about international calling plans and VoIP services. Both can save you money, but which one is best for your situation? First off, let’s go over some of their similarities. For starters, if you want to purchase either a landline phone or VoIP service that allows you to call internationally , then neither are your best bet. International calls made with traditional telephones (landlines) are much more expensive than making international calls using VoIP services.