We had a similar exchange earlier.<p>If the phone number isn&#x27;t my identity - what is the phone number for? I don&#x27;t need a phone number to generate my key, do I? It seems, as far as I can follow from the outside, that phone numbers are used as namespace. Maybe &#x27;identity&#x27; goes too far, but so far I understand that the number you register with is your - erm - user id?<p>Help me out. If that&#x27;s totally wrong, if I &quot;didn&#x27;t get it&quot;, I&#x27;d be glad to learn more. But .. then again: Why require a phone number (-&gt; No standalone client on the desktop)?<p>Thomas basically destroyed that security argument already, and I&#x27;d actually prefer a niche OS (FxOS, but I&#x27;m getting more and more into SailfishOS demos atm).