Maybe it's just me but in my opinion it has to be healthcare like doctors offices, hospitals, and clinics.
What made it more difficult was that I only had the general hospital/clinic numbers to work with.
The easiest I've experienced were small blue collar businesses like HVAC, roofers, plumbers, electricians, ect.
Solar was surprisingly easy as well.
What's the most difficult industry you've dialed?
What was the easiest?
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