Hi, yeah this would be an edge case that I thought it wouldn't be a big deal.

With that said, if we're using the semicolon as a delimiter, I believe it would be weird (or dirty when talking in the context of data engineering) to have a leading or trailing white space in it. As we're essentially saying that one of the phone number would be " +31 6 30898025".

I've always understood OSM as a database of geographical data for apps (etc.), rather than a final frontend for the end user. So in this context, it would be up to the data user (apps) to decided how to format it.