Although it is generally free to sign up for many VoIP services, there are occasions in which you do have to pay to access features that are considered premium (such as video conferencing). In order to make VoIP calls to regular landline or mobile numbers, it will require a monthly subscription or will be on a pay-per-minute basis, depending on which service provider you are with. As with traditional services, you will also find call bundles which might include “unlimited” call plans. Be sure to read the Terms and Conditions for such bundles, there might be a fair usage policy.