[raziel2p]

Eh, most messengers use phone number as the primary identifier these days. Whether I use Telegram, Signal or WhatsApp, I add people using their phone number. In the last 3 years or so I can think of one exception where someone preferred Discord but I still got their phone number as a "backup".

[darren_]

Over here it's either LINE (does support adding by number but can't remember the last time I used that, literally years) or FB/Instagram.