I paid $40 to transfer my old phone # to OOMA. I had an occasional ROBO call, but blocked them with no problem. About 3 weeks after I went with OOMA I started getting this number 403 476-****, 5-6 times every day. I was told that I could purchase their Premier plan for an extra $10.00 a month. Interestingly, after I installed that plan, that particular number stopped immediately. I dropped the plan after 1 month, and that same ROBO number came back with a vingaence in just a few hours. I HAVE EVERY REASON TO BELIEVE THAT OOMA IS GENERATING THESE ROBO CALLS TO ENTICE THEIR SUBSCRIBERS TO BUY THEIR PREMIER PLAN. INCIDENTALLY, AT LEAST 3 CALLS EACH DAY COME IN WHILE MOST PEOPLE ARE SLEEPING. User's recommendation: Anything related to OOMA, block it, delete it, run from it.