I saw something on the web page that suggested the trial amount might be $5 in the future.
In addition to making a call with a registered device you can route an IPkall call number to your user
name@outbound.circlenet.us . If you call that number you get prompted to enter a pin. The pin is your user name. Then you can make an outbound call. I found that you can call
anynumber@outbound.circlenet.us and you will be prompted for a pin which is your user name after that the call will go out immediately to the number in front of the @ sign.
I have CID working but I don't know yet if it was a change that I made or if it simply takes time for CID to start working. I believe it was the latter.