Work number and personal number on the same device. I’ve friends that switched their number completely to their work number because of the lack of dual sim phones back in the day. That is just a poor decision all around. I know someone who had to negotiate a release of the phone number to him in the compensation package when they were let go
That sounds a little questionable to me. I'd want the company to buy me a new phone because they likely consider all the associated data to be their property, and also because I wouldn't want my real phone subpoenaed in a lawsuit.