installation of another operating system on a 15.6 inches Windows Smartphone or a 15.6 inches Windows Cellular Laptop

For example , Linux Operating System KNOPPIX or Linux Operating SystemUbuntu 
which can boot from a USB Flash Drive or boot from an External USB Hard Disk Drive . It is very handy for  IT Technicians or  IT Engineers  or anyone who wishes to install other  Operating  Systems for hardware/software maintenance or troubleshooting purposes or for educational purposes .

As usual , the  15.6 inches  Windows Smartphone  cannot receive incoming calls or make telephone calls when we are installing another Operating Systems ,  or when we are half way installing another Operating System , like  Linux Operating System  KNOPPIX  or  Linux Operating System  Ubuntu .  But after we have finish with the installation and do whatever we wishes to do with the new Operating System that is  connected  to the 15.6 inches  Windows  Smartphone , we just have to shutdown the new Operating System .  Then ,  reboot/restart  the  15.6 inches  Windows Smartphone   and  we are back to normal . Now , we can make phone calls , we can receive phone calls , we can send sms , we can WhatsApp , we can WeChat , we can Snapchat , we can watch YouTube/Videos/Movies , we can connect to printers , we can connect to scanners , and a long list of everything the PC can do ……..…….. we can also do with our  15.6 inches  Windows Smartphone
(15.6 inches  Windows 10    Laptop/Tablet/Smartphone   hybrid).