Robo calls, spam calls etc.

I have used various outside cell phones, other businesses, friends etc to call this phone and all calls do go through, even voicemail works. 

It's just weird that I'm not like harassed every day like cell phone users are. 

So now I am confused. Are you saying it works, but your not getting spam calls?

It's just weird that I'm not like harassed every day like cell phone users are. 

Could it be CVT or Call validation? See here.

This seems logical. I wondered if there was a seperation between business numbers and residential/private numbers. 

I'm unsure how or if there is a "separation."  I'm sure providers would like to maintain a clear delineation between their business and residential assignments; however, I'd think it'd be difficult to maintain.

If a business switches from Verizon to Cox, I'm sure the business would want to transfer their Verizon business number to Cox.  Would this number be in the business allocation of Cox?  If a business wants a vanity number, such as KARS-4-KIDS, would this number be in the allocation?

I'm not sure how it works.  I think the separation is just where the scammers get their dialing lists.  I can't speak for anyone else, but it appears my spam calls have significantly dropped over the past year.  Perhaps we're just in a weird cycle.

I inquired about a vanity number for my business account and was quickly told no due to Cox only has access to a certain block of numbers. 

Thank you, but service is working fine as already mentioned.