Do I need two phones for work n personal business?

Depends on the company. If they can or do pry into your usage then have a personal phone too. Ask co-workers, especially those in IT. When I worked as a consultant, I had a work phone paid for by the company but they never monitored anyone's usage or apps - I bought the phone myself and they just paid the bills. If they give you a phone and install something on it then get a personal phone as well.