[mikeash]

You’ll be able to see them as individual dots any time they’re illuminated by the sun when they fly over at night (like any other satellite), but they won’t be bunched together like this.

[perilunar]

Each time they launch a new batch you'll see them like this briefly. There's 100+ launches planned over the next decade.

[19870213]

And astronomers where 'enjoying' the last Iridium Flares (their new satellites don't produce the flare). :)