The inability to directly associate multiple Google Voice numbers with a single primary phone number stems from design choices intended to manage identity and prevent potential misuse of the service. Google Voice functions by forwarding calls and messages from a designated Google Voice number to linked devices, including a user’s personal phone. Allowing multiple Google Voice numbers to forward to the same phone number complicates the system and introduces potential conflicts in routing and user identification.
This restriction is important for maintaining the integrity of the service, preventing abuse such as spamming or masking illegal activities. It also simplifies account management and reduces the likelihood of confusion regarding which Google Voice number is being used for outgoing communication. While inconvenient for some users, this constraint is a necessary trade-off for the overall stability and security of the platform. Historically, Google Voice has prioritized individual account security and functionality over multi-account, single-device support.