> The german carrier Telekom allows you to take posession (add it to your customer account as a "contract owner") of a phone number with just the PUK and a one-

> The german carrier Telekom allows you to take posession (add it to your customer account as a "contract owner") of a phone number with just the PUK and a one-time code sent to the phone number via SMS. I guess many other carriers use the same system. Ah, very interesting. I was unaware of this usage of the PUK. If it's used for account ownership authentication, then absolutely carriers should be treating it way more securely.