[taldo]

There's Burner (https://burnerapp.com) and I'm sure there are at least a handful others around.

[zikduruqe]

I use TextNow for those times that I have to give a number. https://www.textnow.com

You can't use it for certain 2FA situations, but it works for Craigslist transactions or when some business requires it.

[solardev]

Awesome, thanks! Looks like it's only one alternate number at a time, but that's probably enough for spam.