Any recommendations for a second phone number to keep primary number private?

I want to get a second phone number temporarily at least, but the first one listed and highly recommended is of course the Burner app which collects everything short of your fingerprints and your grandmother’s elementary school record. WTF? And what is “User Content?”
Anyway, all the apps look crappy to me from a privacy standpoint. (Yes mods I read the Wiki there’s nothing there about phone numbers.)

Please help with suggestions? Thanks!

app apps burner course fingerprints phone phone number privacy private recommendations school what is