The draft brought up a very interesting aspect of Telephone Numbers (TNs), especially the mobile phone number which is widely used for getting "secure code" for secure access to very sensitive content, such as bank account. 

However, the draft only describes how today's TNs are acquired and managed (e.g. the Use cases in Section 4). Two issues with the draft:
1) The draft didn't have the content to describe what is the problems with the current practices. (I was expecting to read the "problems" when I started to read the draft)
2) The draft didn't describe the problems of using mobile phone number for authenticating the access to sensitive data content. 

Linda dunbar