Are numbers reused? If so, is it not a huge security concern when activating a service?
They're not reused, but use 2FA to be on the safe side as we don't own the SIM cards themselves.
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Exactly. I'd like to know how this could be used for Telegram if the numbers are reused.
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There's 2FA on Telegram, Whatsapp and most other messengers. We're not reusing them, but with 2FA enabled you shouldn't even care.
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