Now it is no longer reserved for those who have paid for a premium subscription with Skype, which can benefit from video conversations with several at a time.
It has been free to have video conversations with several at times on Skype. It happens in an attempt to keep the competition from Google and their Hangouts at Bay in the battle for video chat users.
Skype was the first who introduced the video conversations with several at a time, but it is an option that has been reserved for the paying consumers since 2011.
In a statement says Skype, too, that they will make the possibility of these video calling groups available for several platforms in the future, which probably means that it will be an option from your mobile phone too.
Right now it is not possible to have group video calling from the phone even if you have paid for the premium subscription.