I’ve had Vonage for a little over a year now and use it for my business line. Works fine thus far. Sorry you’re having problems. Really like their message system and a whole lot less expensive than a business line through AT&T. Ring Central maintains a listing of all in-bound and out-bound calls available via the Internet if I ever forget to write someone’s number down.
Considered getting a cell phone line to use for just business but I much prefer being able to talk on a regular phone equipped with a speaker so I can do other things when I’m on hold.
It does get frustrating though when the internet is down for any reason because then I do have to make outgoing calls on my personal cell.
The problems have cleared up.
Overall I have been happy with vonage.