Your business is legally entitled to retain your phone numbers when switching from a Legacy PBX to UCaaS, with incredibly rare exceptions such as relocating your business over a substantial geographic distance. The FCC is very clear that number porting is a legal right, not an optional benefit for companies who switch communications providers or upgrade technology. In their own words, “You can switch telephone service providers for wireline, wireless, or Voice over Internet Protocol and keep your existing phone number if you remain in the same geographic area.” This concept is called Local Number Portability or LNP for short.