I dropped OOMA a couple of years ago after repeated calling problems over several months. I switched to an Obi VOIP adapter (I use an Obi202) that lets me use my choice of several different service providers, including the free Google Voice. If one provider's service degrades too much, it's easy to switch to another one without any hardware changes. I've been using PhonePower with the Obi for the past year, and have been very satisfied with their performance. Google Voice is also configured as a backup if needed.