You can switch your home phone number, business phone number and mobile phone number to the Extension-N VoIP under the same account, setup all 3 numbers in the SIP on your mobile device, select different ring tones for each phone number. Then when business people phone you, you know it’s for business before answering it. While 2 people calls you at the same time, you can hold it to switch talking to different people. Never miss a call, whatever it’s for home, business or personal call.
Or you can buy an extra phone number (just $2.99 per month) for another purpose and setup on the same mobile phone.