Most of the offices tend to use the same phone number for many years. As a result, this phone number often becomes the identity their business. This is why most of the companies are not willing to abandon their old phone numbers while switching to VoIPFortunately, it is possible to continue using the same existing phone number while switching over to a VoIP phone service.The feature that allows users to retain their old phone number even after a change in service provider is called portability. What is Portability?The Federal Communications...