I've kept my old call centric line because it is so cheap and rarely used. Glad I did when I found voipo doesn't allow international calls from BYOD. I don't make many but was happier to pay .05/minute instead of having to call from my cell.

PAYG isn't of much interest. I like 1 low monthly rate. I had a Vonage 500 outbound minute plan for 2 years but when they tried to jack up the price (from $15/month to $18/month) I planned on leaving. They offered to give me unlimited for a year at $15/month so I stayed finally leaving for call centric (then voipo) because vonage did not offer a call routes/treatment feature.