SINOPSIS DEL LIBRO

<p>This book provides brief survey of the some Voice Over IP (VOIP) providers, including the providers that offers free calls to some countries. Then, I will mention some websites that offer virtual phone numbers from around the world to receive activation codes and SMS confirmations online.<br>.<br>The report consists from the following parts:<br><br>- How does VOIP work?<br>- Getting free phone number in US or Canada and other countries<br>- Be...Seguir leyendo