Ooma's Premier service requires you to pay by credit card/bank withdrawl a year in advance and will automatically renew annually. When I went to ooma.com to turn off the renewal (I was paid up throught he end of Oct 2015 and was set to renew in Nov 1, 2015.
When I clicked the "change subscription" link on the the Ooma Web site, i was informed that i couldn't change or cancel my subscription online and that I must call their customer service (1-888-711-6662) to change it. So, I called and asked to turn off the automatic renewal of my Premier subscription so that when it expired at the end of October 2015, I wouldn't automatically be charged over $120 to renew it.
I was astonished when she told me that she couldn't do that and that I would have to wait until it was about to expire (end of Oct 2015) if I wanted to continue using the Premier service i had already paid over $120 for in advance. The customer service rep did offer to cancel my service at the end of this month (Feb 2015), but if I did that I would lose the Premier service that i had already paid for in advance and would be refunded for the months I didn't use.
Ooma's equipment/VOIP quality is okay and I've been satisfied with it for over a year.
I want to warn others to be careful when purchasing any of Ooma services in advance because their business model makes it very difficult to stop services and/or automatic charges.