Is it free to play trombone with 66 cornet before the unit virtual network?

It's free. According to the use method of cornet query, it is free to play trombone with 66 cornet and information before the company virtual network. The caller ID number of the other party shows the short number no matter how long or short you dial. Group V network refers to the way to form a virtual network with members in units. You can talk to each other with cornet and trombone, and enjoy a lower call discount.