https://youmai.com/ is in just this business. They operate primarily in the US. I could see this getting complicated to do on a global basis. Their use case is business numbers for small tradesmen, etc. to take business calls on a mobile without disclosing device phone number.
Many VoIP terrestrial carriers offer additional numbers. For example, OOMA Premier service includes a second in/out number. Can be set up to forward to mobile.
https://youmai.com/ is in just this business. They operate primarily in the US. I could see this getting complicated to do on a global basis. Their use case is business numbers for small tradesmen, etc. to take business calls on a mobile without disclosing device phone number.
Many VoIP terrestrial carriers offer additional numbers. For example, OOMA Premier service includes a second in/out number. Can be set up to forward to mobile.