Virtual phone line is a call forward and call diversion service. This service gives you a local number pointed to your existing phone number.
You can buy numbers from over 50+ countries and you can forward your number on your mobile, landlines and chat messengers you want.
You can receive calls from any state or country even if your not there, for example you are living in USA and your parents live in Pakistan, every time your parents call you, it charges them too much, so you buy a Pakistani virtual number, and give that number to your parents, it will be a local call for them cause its a Pakistani local number, so it will be local charges for them.
You can signup and get a FREE USA number to test it out.