How do I stop some numbers from being underlined

[trax1971 0]

How do I stop some numbers from being underlined.

[Martin Packer 162]

What platform?

 

And to flip it on its head:

 

1. Under what conditions do I get numbers to be underlined (linked)?
2. What does this do for me? Automatic dialing hotlink on certain phones?

This actually sounds like URI / URL recognition and underlining. Which translates into "open in your default browser" or maybe "open the linked page from within Evernote".