Landline for incoming customer calls. Technically it's a package deal with the cable internet company.

My cell for real business, like my distributors. Mostly we text.

Nothing sucks about it. People call, we answer.

At Matasano --- and this is back to like 2005 --- we just used an online telephony provider that routed calls to our mobile phones. I'd probably still just do that today.

Google Voice for local, VOIP. ms for toll-free text and call in US and Canada. No live calls. Everything goes to voicemail and we call back.

I use https://www.quo.com/ (previously OpenPhone).

(no affiliation besides being a customer)