[sunrunner]

Interestingly, the entire line gets formatted once it reaches seven digits, +lines and -lines both, so I guess the -lines is just interpreted as a dash. But your eight digit string doesn't. Perhaps it's not interesting, though I've never really given it a second thought before.

[layer8]

There’s certainly some regex or similar involved that tries to recognize phone numbers, and then hyperlinks the whole thing. My point was that it’s not solely the plus sign that is triggering it.