It seems odd to me that people still need separate phones for personal/business. Aren't there services that allow you to set up a separate number that goes stra

It seems odd to me that people still need separate phones for personal/business. Aren't there services that allow you to set up a separate number that goes straight to the same phone? I know Google Voice does that, and lets you even set filters so that it (for example) only rings during business hours and goes straight to voicemail otherwise.