I'm not one for writing many bad reviews, because someone inevitably has a good experience which makes my negative review look unreliable, but in this case, I have to say, RingCentral is bad. It's been weeks, and after a half dozen calls to find out why my fax number hasn't been activated, I'm still shaking my head wondering how they can stay in business. After talking to "Steve", "Max" and "David" over a two week period (all call center employees in India or some other place where they thinly disguise their accents and use friendly American names) I'm still waiting, with no reasonable explanation for the delay. I do, however, get tons of automated emails from RingCentral "customer service" telling me how happy I must be, and offering me up to $300 for referring another business to Ring Central (the referral is actually $10/line, so your friends need to sign up for 30 fax lines). Suck it RingCentral, I have a small business to run. I'm going with eFax.
UPDATE: within hours of posting my Trustpilot review, my RingCentral account was activated and I got an email apology. I'll run with it for a while.