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Yeah, this will immediately stop me from wanting to further engage with you if you do this.

It's kind of ironic how little respect for someone else's privacy this behavior exhibits, considering the intent.

That's the height of obnoxious. I can't really imagine the level of self-centeredness required to think that's okay.

Who the heck would even hand over their phone to someone just to get a phone number?

It's a common thing. Perhaps not where you are.

In a noisy place? Hand your phone to someone attractive and they call/text themselves, then you and they have eachother's numbers.

Completely agree. And doesn’t installing apps require the owner’s face id or password?

Depends how you have it configured on android at least, if the phone is unlocked already you can install from the play store w/o additional permissions unless it is a paid app

Even on ios it's technically not required. You only need touchid/faceid/password to add the app to your account. Afterwards you can freely install without additional authentication.

I suppose, but you'd need to have downloaded Signal previously.