Like soundview said, if your issue is with caller ID "Name" not showing, while using
Voip.ms, I think by default that feature is turned off at
Voip.ms, and you need to enable it in your account. That could be why it's not coming up.
There is a very small charge for this feature, unless as soundview mentioned, the name is in your phone book and then there is no charge.
The charge for this feature is 8/10th of a cent. Not really a major concern for me especially since most of my incoming calls are from numbers in my phone book.