[Standards] Re: Extended contacts

* XEP proposal3: better contact integration. The contacts data on XMPP apps of Android is very isolated from the rest of apps. All other messaging apps interact well with the device contacts and phone numbers, except for XMPP because it doesn't use phone numbers as identifiers. But once we have XEP proposal2 and we can add personal notes, we can also add a field for phone numbers for contacts that would make it more interoperable with device contacts that are identified with phone numbers.