A valid concern I think. One of the things we’re now looking into is how the home working set-ups of our people looks. Until now, having an office, for our recent colleagues this wasn’t a concern as such.
As to phone numbers, our clients have done away with fixed numbers a long time ago, with most switched through to mobiles by default. However I already noticed that for one client their remote working environment isn’t sturdy enough for the sudden rise in usage.