I checked out the website last night and found that you could register up to three phone numbers at a time right from there. If you have more then that, you can just go back in and add the rest. (I have three cell phones for three people in my family and my home phone). The only thing you have to remember to do is like they say, after you register the numbers, check your email and click on each link to confirm the number (one link for each number registered.) If I remember right, once registered no expiration unless you return and remove the number. Hope this helps.