Porting a US Number
From VoIP.ms Wiki
Porting a number is the process of transfer a number from one company to another. If you are a VoIP.ms customer and have an existing number you would like to have with us, it is possible to bring your number with our service. Toll free numbers, local USA/Canada and even International numbers can be ported with us, you can transfer a landline, cellphone or a number with another VoIP provider.
We count with a LNP (Local Number Portability) department that handle all the porting process and guide the customer though it. They are also in charge to update the customer via email with any relevant information about his port status.
Here are explained all the steps needed to follow in order to port an existing number from another provider to VoIP.MS