I did not find v2.20 but 2.10. documentation says there should be a v2.20. Am I wrong?
By the way: What is the best way to find updates? (Yes, I know that there's a section with updates). In my case I was on v2.0 with that library and it was "hard" to find the newest version to download though I found it in the documentation at once.
Core libraries are usually updated together with the IDE and therefore are not uploaded to the forum.
It is possible that the new library will not be supported by an older version of B4A. You can send an email to support@basic4ppc.com and we will send you Phone library v2.20.