1 acct per number. I got a cheap ass trachone and every 2-3 days have the number changed and create another PVA,,,,then post 2-3 times to get past the re-verification then change again. Combine this with changing your ip and doing 1 post per acct. per day, using Ccleaner and ads that pull and I am getting quite a few leads. I also buy PVA's from a couple of sources and use the same methods with them to get them to last as long as possible.
It's a pain in the butt, but I don't know any other way of doing it.