When the Covid-19 pandemic hit in March 2020 the whole world changed over night, so did business owners attitude to their phone systems. They found that having a phone system that has the phone lines and the controller physically in the office is restrictive as its difficult and expensive for staff to be able to take calls and to do their job from home or elsewhere. With cloud based phone systems all those restrictions disappear.
You can either plug in your physical phone into any internet connection and work. Or use a mobile app or software on your computer to make and receive calls as if you were in the office.