No monthly fee * No need to buy additional hardware viSo ID was developed to work in concert with the SOLO viSo 2, providing a highly accurate method of capturing the lower leg. Use a stand alone iPad Pro or a compatible iPhone in conjunction with any iPad or M1/ M2 Mac computer. Already have a compatible device? Call SOLO today at 800-765-6522 to get started. If you do not have the hardware, speak with a SOLO representative to learn about our 60 day trial program using our hardware, enabling you to discover if a viSo is right for you in an easy and risk-free manner.