Don't think so if SD forums are correct. I added a 2nd line (had a spare phone lying around) and got a "temporary" phone number, ported out the number from the 1st line which closed the line, then called 2 days later and ported the number back in on the 2nd line. A hassle, but for $0/month ($3.40 with taxes) it's worth it. Better than RingPlus ever was.