Yes we can lose phone numbers (I just has been inspired by Vexl app which use numbers), but we also can add skype ID for example, but emails are probably enough.
No Skype just npubs and emails!
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Why npubs? When somebody know npub, he already can DM directly.
That way you have the same handle for FaceTime, Email, Phone, Text. Ideally separate clients for each. This way clients will be more like apps and help transition the masses.
