Well, since you bring it up - we've been Ooma and cell only since March. We have the Premier service, since we want a dedicated fax line number and ring. When it works right it's great. It has never left us with no service, but any glitches or corrections take hours and days on the phone to correct. Example: noticed a $3.47 charge on our card for Ooma. Called to inquire, and found it was a monthly tax which they would refund and cancel since we prepaid on an annual basis. Only way they could do that was to refund our $3.47 charge and our annual charge and restart our service and re-bill the annual charge. Which they did. Except now the cell that was set to ring whenever the home phone rings got no ring tone when calling the house. The house phone rang, but if no one picked up the person on the cell had no idea the home phone was ringing until the answering machine picked up. Ooma fought that over several days before deciding that that was normal operation and that the ability of the cell caller to hear ringing when calling the house prior to the reset was a glitch. Not happy about losing the glitch that had been there for months, but one can spend only so many hours on the phone to India with Biff and Buffy and escalation to trouble service center level three before one decides that life is more than repeating my high school mascot's name and the last four of my social for security purposes. They did give us another 2 months of free Premier service. Sound quality is great, fax works just fine, no need to have a computer on for it to work, more features than Ma Bell, and in a few more months we'll have saved more money than we spent for the service and equipment. Good system and they do call back and try to solve things from their script.